diff --git a/src/app.module.ts b/src/app.module.ts
index 3e76fbc..8c8bcb0 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -32,6 +32,7 @@ import { StorageModule } from './storage/storage.module.js';
 import { ElderModule } from './elder/elder.module.js';
 import { PlanModule } from './plan/plan.module.js';
 import { ElderSvcModule } from './elder-svc/elder-svc.module.js';
+import { OrderModule } from './order/order.module.js';
 import { AppController } from './app.controller.js';
 import { AppService } from './app.service.js';
 
@@ -61,6 +62,7 @@ import { AppService } from './app.service.js';
     ElderModule,
     PlanModule,
     ElderSvcModule,
+    OrderModule,
   ],
   controllers: [AppController],
   providers: [
diff --git a/src/order/dto.ts b/src/order/dto.ts
new file mode 100644
index 0000000..c91a77e
--- /dev/null
+++ b/src/order/dto.ts
@@ -0,0 +1,122 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { IsDateString, IsIn, IsNotEmpty, IsOptional, IsString } from 'class-validator';
+
+/** 工单八态（order_status）。 */
+export const ORDER_STATUSES = [
+  'to_assign',
+  'assigned',
+  'serving',
+  'done',
+  'abnormal',
+  'cancelled',
+  'overdue',
+  'not_met',
+] as const;
+
+/** 派单方式：manual（人工）/ batch_recommend（批量推荐确认）。 */
+export const ASSIGN_MODES = ['manual', 'batch_recommend'] as const;
+
+/** 生成工单入参。plan_id 指向 active 计划，item_list/need_photo 由服务端从 plan_item 快照生成。 */
+export class GenerateOrderDto {
+  @ApiProperty({ description: '老人 ID' })
+  @IsString()
+  @IsNotEmpty()
+  elderId!: string;
+
+  @ApiProperty({ description: '服务计划 ID（须为 active）' })
+  @IsString()
+  @IsNotEmpty()
+  planId!: string;
+
+  @ApiProperty({ description: '服务日期（YYYY-MM-DD）' })
+  @IsDateString()
+  serviceDate!: string;
+
+  @ApiProperty({ description: '时段起（ISO datetime）' })
+  @IsDateString()
+  timeSlotStart!: string;
+
+  @ApiProperty({ description: '时段止（ISO datetime）' })
+  @IsDateString()
+  timeSlotEnd!: string;
+}
+
+/** 派单入参。工单态须为 to_assign，校验老人待遇/计划/当班/时间冲突/资质。 */
+export class AssignOrderDto {
+  @ApiProperty({ description: '工单 ID' })
+  @IsString()
+  @IsNotEmpty()
+  orderId!: string;
+
+  @ApiProperty({ description: '护理员 staff.id' })
+  @IsString()
+  @IsNotEmpty()
+  assigneeId!: string;
+
+  @ApiPropertyOptional({ description: '派单方式：manual/batch_recommend', enum: ASSIGN_MODES })
+  @IsOptional()
+  @IsIn(ASSIGN_MODES)
+  assignMode?: string;
+}
+
+/** 调单入参：改派护理员与/或改时段（均可选，缺省保留原值）；重新校验时间冲突并写 reschedule_log。 */
+export class ReassignOrderDto {
+  @ApiPropertyOptional({ description: '新护理员 staff.id（缺省保留原护理员）' })
+  @IsOptional()
+  @IsString()
+  assigneeId?: string;
+
+  @ApiPropertyOptional({ description: '新时段起（ISO datetime）' })
+  @IsOptional()
+  @IsDateString()
+  timeSlotStart?: string;
+
+  @ApiPropertyOptional({ description: '新时段止（ISO datetime）' })
+  @IsOptional()
+  @IsDateString()
+  timeSlotEnd?: string;
+
+  @ApiPropertyOptional({ description: '调单原因（可选，留痕用）' })
+  @IsOptional()
+  @IsString()
+  reason?: string;
+}
+
+/** 取消工单入参：cancel_reason 必填。 */
+export class CancelOrderDto {
+  @ApiProperty({ description: '取消原因（必填）' })
+  @IsString()
+  @IsNotEmpty()
+  cancelReason!: string;
+}
+
+/** 今日工单查询：service_date 缺省为今天。 */
+export class TodayOrderQuery {
+  @ApiPropertyOptional({ description: '服务日期（YYYY-MM-DD，缺省今天）' })
+  @IsOptional()
+  @IsDateString()
+  serviceDate?: string;
+}
+
+/** 批量推荐查询：推荐某老人某时段的可选护理员（只读，不自动派）。 */
+export class BatchRecommendQuery {
+  @ApiProperty({ description: '老人 ID' })
+  @IsString()
+  @IsNotEmpty()
+  elderId!: string;
+
+  @ApiPropertyOptional({ description: '服务日期（YYYY-MM-DD）' })
+  @IsOptional()
+  @IsDateString()
+  serviceDate?: string;
+
+  @ApiPropertyOptional({ description: '时段起（ISO datetime）' })
+  @IsOptional()
+  @IsDateString()
+  timeSlotStart?: string;
+
+  @ApiPropertyOptional({ description: '时段止（ISO datetime）' })
+  @IsOptional()
+  @IsDateString()
+  timeSlotEnd?: string;
+}
diff --git a/src/order/order.controller.ts b/src/order/order.controller.ts
new file mode 100644
index 0000000..59fe8b4
--- /dev/null
+++ b/src/order/order.controller.ts
@@ -0,0 +1,64 @@
+import { Body, Controller, Get, Param, Post, Query } from '@nestjs/common';
+import { Permissions } from '../common/permissions.js';
+import { AuditLog, RequirePermissions } from '../auth/decorators.js';
+import {
+  AssignOrderDto,
+  BatchRecommendQuery,
+  CancelOrderDto,
+  GenerateOrderDto,
+  ReassignOrderDto,
+  TodayOrderQuery,
+} from './dto.js';
+import { OrderService } from './order.service.js';
+
+@Controller('order')
+export class OrderController {
+  constructor(private readonly service: OrderService) {}
+
+  @Post('generate')
+  @RequirePermissions(Permissions.order.generate)
+  @AuditLog('order', 'generate')
+  generate(@Body() dto: GenerateOrderDto) {
+    return this.service.generate(dto);
+  }
+
+  @Post('assign')
+  @RequirePermissions(Permissions.order.assign)
+  @AuditLog('order', 'assign')
+  assign(@Body() dto: AssignOrderDto) {
+    return this.service.assign(dto);
+  }
+
+  // 注意：静态路径 batch-recommend/today 必须先于 :id 声明，否则 :id 会吞掉它们。
+  @Get('batch-recommend')
+  @RequirePermissions(Permissions.order.assign)
+  batchRecommend(@Query() q: BatchRecommendQuery) {
+    return this.service.batchRecommend(q);
+  }
+
+  @Get('today')
+  @RequirePermissions(Permissions.order.today)
+  today(@Query() q: TodayOrderQuery) {
+    return this.service.today(q);
+  }
+
+  @Post(':id/reassign')
+  @RequirePermissions(Permissions.order.reassign)
+  @AuditLog('order', 'reassign')
+  reassign(@Param('id') id: string, @Body() dto: ReassignOrderDto) {
+    return this.service.reassign(id, dto);
+  }
+
+  @Post(':id/cancel')
+  @RequirePermissions(Permissions.order.cancel)
+  @AuditLog('order', 'cancel')
+  cancel(@Param('id') id: string, @Body() dto: CancelOrderDto) {
+    return this.service.cancel(id, dto);
+  }
+
+  @Get(':id')
+  @RequirePermissions(Permissions.order.detail)
+  detail(@Param('id') id: string) {
+    return this.service.detail(id);
+  }
+}
diff --git a/src/order/order.module.ts b/src/order/order.module.ts
new file mode 100644
index 0000000..fc0b234
--- /dev/null
+++ b/src/order/order.module.ts
@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { OrderController } from './order.controller.js';
+import { OrderService } from './order.service.js';
+
+@Module({
+  controllers: [OrderController],
+  providers: [OrderService],
+})
+export class OrderModule {}
diff --git a/src/order/order.service.spec.ts b/src/order/order.service.spec.ts
new file mode 100644
index 0000000..8623332
--- /dev/null
+++ b/src/order/order.service.spec.ts
@@ -0,0 +1,332 @@
+import { describe, expect, it, vi } from 'vitest';
+import { OrderService, isTimeOverlap } from './order.service.js';
+import type { PrismaService } from '../prisma/prisma.service.js';
+import { ErrorCodes } from '../common/error-codes.js';
+import { runWithRequestContext } from '../common/context/request-context.js';
+import type { RequestContext } from '../common/context/request-context.js';
+
+const ctx: RequestContext = {
+  tenantCode: 'T001',
+  userId: 'u1',
+  username: 'admin',
+  super: false,
+  dataScope: 'all',
+  orgCode: null,
+  orgCodes: [],
+};
+
+const t = (hh: string, mm: string) => new Date(`2026-10-14T${hh}:${mm}:00Z`);
+
+function makeOrder(overrides: Record<string, unknown> = {}): Record<string, any> {
+  return {
+    id: 'o1',
+    tenantCode: 'T001',
+    elderId: 'e1',
+    planId: 'p1',
+    serviceDate: new Date('2026-10-14T00:00:00Z'),
+    timeSlotStart: t('09', '00'),
+    timeSlotEnd: t('10', '00'),
+    assigneeId: null,
+    assignTime: null,
+    assignMode: null,
+    orderStatus: 'to_assign',
+    itemList: [],
+    needPhoto: false,
+    ...overrides,
+  };
+}
+
+function makeService(
+  overrides: {
+    orderFindUnique?: ReturnType<typeof vi.fn>;
+    orderFindMany?: ReturnType<typeof vi.fn>;
+    orderCreate?: ReturnType<typeof vi.fn>;
+    orderUpdate?: ReturnType<typeof vi.fn>;
+    orderCount?: ReturnType<typeof vi.fn>;
+    planFindUnique?: ReturnType<typeof vi.fn>;
+    planFindFirst?: ReturnType<typeof vi.fn>;
+    planItemFindMany?: ReturnType<typeof vi.fn>;
+    elderFindFirst?: ReturnType<typeof vi.fn>;
+    staffFindFirst?: ReturnType<typeof vi.fn>;
+    staffFindMany?: ReturnType<typeof vi.fn>;
+  } = {},
+) {
+  const orderFindUnique = overrides.orderFindUnique ?? vi.fn().mockResolvedValue(null);
+  const orderFindMany = overrides.orderFindMany ?? vi.fn().mockResolvedValue([]);
+  const orderCreate = overrides.orderCreate ?? vi.fn().mockResolvedValue(makeOrder());
+  const orderUpdate = overrides.orderUpdate ?? vi.fn().mockResolvedValue(makeOrder());
+  const orderCount = overrides.orderCount ?? vi.fn().mockResolvedValue(0);
+  const planFindUnique = overrides.planFindUnique ?? vi.fn().mockResolvedValue(null);
+  const planFindFirst = overrides.planFindFirst ?? vi.fn().mockResolvedValue(null);
+  const planItemFindMany = overrides.planItemFindMany ?? vi.fn().mockResolvedValue([]);
+  const elderFindFirst = overrides.elderFindFirst ?? vi.fn().mockResolvedValue(null);
+  const staffFindFirst = overrides.staffFindFirst ?? vi.fn().mockResolvedValue(null);
+  const staffFindMany = overrides.staffFindMany ?? vi.fn().mockResolvedValue([]);
+
+  const prisma = {
+    client: {
+      order: {
+        findUnique: orderFindUnique,
+        findMany: orderFindMany,
+        create: orderCreate,
+        update: orderUpdate,
+        count: orderCount,
+      },
+      plan: { findUnique: planFindUnique, findFirst: planFindFirst },
+      planItem: { findMany: planItemFindMany },
+      elder: { findFirst: elderFindFirst },
+      staff: { findFirst: staffFindFirst, findMany: staffFindMany },
+    },
+  };
+  const service = new OrderService(prisma as unknown as PrismaService);
+  return {
+    service,
+    orderFindUnique,
+    orderFindMany,
+    orderCreate,
+    orderUpdate,
+    orderCount,
+    planFindUnique,
+    planFindFirst,
+    planItemFindMany,
+    elderFindFirst,
+    staffFindFirst,
+    staffFindMany,
+  };
+}
+
+describe('isTimeOverlap', () => {
+  it('同 assignee 时段重叠 → true', () => {
+    expect(isTimeOverlap(t('09', '00'), t('10', '00'), t('09', '30'), t('10', '30'))).toBe(true);
+  });
+
+  it('首尾相接（09:00-10:00 vs 10:00-11:00）不算重叠', () => {
+    expect(isTimeOverlap(t('09', '00'), t('10', '00'), t('10', '00'), t('11', '00'))).toBe(false);
+  });
+
+  it('完全不相邻时段 → false', () => {
+    expect(isTimeOverlap(t('09', '00'), t('10', '00'), t('11', '00'), t('12', '00'))).toBe(false);
+  });
+});
+
+describe('OrderService.generate', () => {
+  it('无 active 计划 → 拒绝（1002）', async () => {
+    const planFindUnique = vi.fn().mockResolvedValue({ id: 'p1', elderId: 'e1', planStatus: 'draft' });
+    const { service, orderCreate } = makeService({ planFindUnique });
+
+    await expect(
+      runWithRequestContext(ctx, () =>
+        service.generate({
+          elderId: 'e1',
+          planId: 'p1',
+          serviceDate: '2026-10-14',
+          timeSlotStart: '2026-10-14T09:00:00Z',
+          timeSlotEnd: '2026-10-14T10:00:00Z',
+        }),
+      ),
+    ).rejects.toMatchObject({
+      response: { code: ErrorCodes.ORDER_STATUS_INVALID, message: expect.stringContaining('1002') },
+    });
+
+    expect(orderCreate).not.toHaveBeenCalled();
+  });
+
+  it('有 active 计划 → 从 plan_item 生成 item_list 快照 + need_photo', async () => {
+    const planFindUnique = vi.fn().mockResolvedValue({ id: 'p1', elderId: 'e1', planStatus: 'active' });
+    const planItemFindMany = vi.fn().mockResolvedValue([
+      { svcId: 'svc1', svcNameSnapshot: '协助翻身', svcCodeSnapshot: 'C001', photoTier: 'must', needCert: true },
+      { svcId: 'svc2', svcNameSnapshot: '助浴', svcCodeSnapshot: 'C002', photoTier: 'free', needCert: false },
+    ]);
+    const orderCreate = vi.fn().mockResolvedValue(makeOrder());
+    const { service } = makeService({ planFindUnique, planItemFindMany, orderCreate });
+
+    await runWithRequestContext(ctx, () =>
+      service.generate({
+        elderId: 'e1',
+        planId: 'p1',
+        serviceDate: '2026-10-14',
+        timeSlotStart: '2026-10-14T09:00:00Z',
+        timeSlotEnd: '2026-10-14T10:00:00Z',
+      }),
+    );
+
+    expect(orderCreate).toHaveBeenCalledWith({
+      data: expect.objectContaining({
+        tenantCode: 'T001',
+        createdBy: 'u1',
+        elderId: 'e1',
+        planId: 'p1',
+        orderStatus: 'to_assign',
+        needPhoto: true,
+        itemList: [
+          expect.objectContaining({ svcId: 'svc1', svcName: '协助翻身', svcCode: 'C001' }),
+          expect.objectContaining({ svcId: 'svc2', svcName: '助浴', svcCode: 'C002' }),
+        ],
+      }),
+    });
+  });
+});
+
+describe('OrderService.assign', () => {
+  const baseAssign = { orderId: 'o1', assigneeId: 's1', assignMode: 'manual' };
+
+  it('waiting_period 允许派单', async () => {
+    const orderFindUnique = vi.fn().mockResolvedValue(makeOrder());
+    const elderFindFirst = vi.fn().mockResolvedValue({ id: 'e1', treatStatus: 'waiting_period' });
+    const planFindUnique = vi.fn().mockResolvedValue({ id: 'p1', planStatus: 'active' });
+    const staffFindFirst = vi.fn().mockResolvedValue({ id: 's1', employStatus: 'on', certNo: null, certType: null });
+    const orderUpdate = vi.fn().mockResolvedValue(makeOrder({ orderStatus: 'assigned' }));
+    const { service } = makeService({
+      orderFindUnique,
+      elderFindFirst,
+      planFindUnique,
+      staffFindFirst,
+      orderUpdate,
+    });
+
+    const res = await runWithRequestContext(ctx, () => service.assign(baseAssign));
+
+    expect(res.orderStatus).toBe('assigned');
+    expect(orderUpdate).toHaveBeenCalledWith({
+      where: { id: 'o1' },
+      data: expect.objectContaining({
+        orderStatus: 'assigned',
+        assigneeId: 's1',
+        assignMode: 'manual',
+        assignTime: expect.any(Date),
+      }),
+    });
+  });
+
+  it('benefit_expired 拒绝（1001）', async () => {
+    const orderFindUnique = vi.fn().mockResolvedValue(makeOrder());
+    const elderFindFirst = vi.fn().mockResolvedValue({ id: 'e1', treatStatus: 'benefit_expired' });
+    const planFindUnique = vi.fn().mockResolvedValue({ id: 'p1', planStatus: 'active' });
+    const { service, orderUpdate } = makeService({ orderFindUnique, elderFindFirst, planFindUnique });
+
+    await expect(
+      runWithRequestContext(ctx, () => service.assign(baseAssign)),
+    ).rejects.toMatchObject({
+      response: { code: ErrorCodes.ORDER_STATUS_INVALID, message: expect.stringContaining('1001') },
+    });
+
+    expect(orderUpdate).not.toHaveBeenCalled();
+  });
+
+  it('同 assignee 时段重叠 → ORDER_CONFLICT（2001）拒绝', async () => {
+    const orderFindUnique = vi.fn().mockResolvedValue(makeOrder());
+    const elderFindFirst = vi.fn().mockResolvedValue({ id: 'e1', treatStatus: 'active' });
+    const planFindUnique = vi.fn().mockResolvedValue({ id: 'p1', planStatus: 'active' });
+    const staffFindFirst = vi.fn().mockResolvedValue({ id: 's1', employStatus: 'on', certNo: null, certType: null });
+    const orderFindMany = vi.fn().mockResolvedValue([
+      { id: 'o-other', assigneeId: 's1', timeSlotStart: t('09', '30'), timeSlotEnd: t('10', '30') },
+    ]);
+    const { service, orderUpdate } = makeService({
+      orderFindUnique,
+      elderFindFirst,
+      planFindUnique,
+      staffFindFirst,
+      orderFindMany,
+    });
+
+    await expect(
+      runWithRequestContext(ctx, () => service.assign(baseAssign)),
+    ).rejects.toMatchObject({
+      response: { code: ErrorCodes.ORDER_CONFLICT, message: expect.stringContaining('2001') },
+    });
+
+    expect(orderUpdate).not.toHaveBeenCalled();
+  });
+
+  it('首尾相接时段不算冲突 → 派单成功', async () => {
+    const orderFindUnique = vi.fn().mockResolvedValue(makeOrder());
+    const elderFindFirst = vi.fn().mockResolvedValue({ id: 'e1', treatStatus: 'active' });
+    const planFindUnique = vi.fn().mockResolvedValue({ id: 'p1', planStatus: 'active' });
+    const staffFindFirst = vi.fn().mockResolvedValue({ id: 's1', employStatus: 'on', certNo: null, certType: null });
+    const orderFindMany = vi.fn().mockResolvedValue([
+      { id: 'o-other', assigneeId: 's1', timeSlotStart: t('10', '00'), timeSlotEnd: t('11', '00') },
+    ]);
+    const orderUpdate = vi.fn().mockResolvedValue(makeOrder({ orderStatus: 'assigned' }));
+    const { service } = makeService({
+      orderFindUnique,
+      elderFindFirst,
+      planFindUnique,
+      staffFindFirst,
+      orderFindMany,
+      orderUpdate,
+    });
+
+    const res = await runWithRequestContext(ctx, () => service.assign(baseAssign));
+
+    expect(res.orderStatus).toBe('assigned');
+  });
+});
+
+describe('OrderService.reassign', () => {
+  it('调单写 reschedule_log（改前改后）', async () => {
+    const orderFindUnique = vi.fn().mockResolvedValue(
+      makeOrder({
+        orderStatus: 'assigned',
+        assigneeId: 's-old',
+        assignTime: new Date('2026-10-14T08:00:00Z'),
+        assignMode: 'manual',
+      }),
+    );
+    const staffFindFirst = vi.fn().mockResolvedValue({ id: 's-new', employStatus: 'on' });
+    const orderFindMany = vi.fn().mockResolvedValue([]);
+    const orderUpdate = vi.fn().mockResolvedValue(makeOrder({ orderStatus: 'assigned', assigneeId: 's-new' }));
+    const { service } = makeService({
+      orderFindUnique,
+      staffFindFirst,
+      orderFindMany,
+      orderUpdate,
+    });
+
+    await runWithRequestContext(ctx, () =>
+      service.reassign('o1', { assigneeId: 's-new', timeSlotStart: '2026-10-14T11:00:00Z', timeSlotEnd: '2026-10-14T12:00:00Z' }),
+    );
+
+    expect(orderUpdate).toHaveBeenCalledWith({
+      where: { id: 'o1' },
+      data: expect.objectContaining({
+        assigneeId: 's-new',
+        timeSlotStart: expect.any(Date),
+        timeSlotEnd: expect.any(Date),
+        rescheduleLog: expect.arrayContaining([
+          expect.objectContaining({
+            from: expect.objectContaining({ assigneeId: 's-old' }),
+            to: expect.objectContaining({ assigneeId: 's-new' }),
+            operatorId: 'u1',
+            at: expect.any(Date),
+          }),
+        ]),
+      }),
+    });
+  });
+});
+
+describe('OrderService.cancel', () => {
+  it('缺 cancel_reason → 拒绝', async () => {
+    const { service, orderUpdate } = makeService();
+
+    await expect(
+      runWithRequestContext(ctx, () => service.cancel('o1', { cancelReason: '' })),
+    ).rejects.toMatchObject({ response: { code: ErrorCodes.ORDER_STATUS_INVALID } });
+
+    expect(orderUpdate).not.toHaveBeenCalled();
+  });
+
+  it('有 cancel_reason → order_status=cancelled', async () => {
+    const orderFindUnique = vi.fn().mockResolvedValue(makeOrder());
+    const orderUpdate = vi.fn().mockResolvedValue(makeOrder({ orderStatus: 'cancelled' }));
+    const { service } = makeService({ orderFindUnique, orderUpdate });
+
+    const res = await runWithRequestContext(ctx, () => service.cancel('o1', { cancelReason: '老人转院' }));
+
+    expect(res.orderStatus).toBe('cancelled');
+    expect(orderUpdate).toHaveBeenCalledWith({
+      where: { id: 'o1' },
+      data: { orderStatus: 'cancelled', cancelReason: '老人转院' },
+    });
+  });
+});
diff --git a/src/order/order.service.ts b/src/order/order.service.ts
new file mode 100644
index 0000000..58d08e3
--- /dev/null
+++ b/src/order/order.service.ts
@@ -0,0 +1,316 @@
+import { BadRequestException, HttpStatus, Injectable } from '@nestjs/common';
+import { PrismaService } from '../prisma/prisma.service.js';
+import { getRequestContext } from '../common/context/request-context.js';
+import { BusinessException } from '../common/business-exception.js';
+import { ErrorCodes } from '../common/error-codes.js';
+import { toDateOnly } from '../elder/elder.service.js';
+import {
+  AssignOrderDto,
+  BatchRecommendQuery,
+  CancelOrderDto,
+  GenerateOrderDto,
+  ReassignOrderDto,
+  TodayOrderQuery,
+} from './dto.js';
+
+/**
+ * 时段重叠判定（严格 <，首尾相接不算重叠）。
+ * 即 aStart < bEnd && bStart < aEnd；09:00-10:00 与 10:00-11:00 不相邻重叠。
+ */
+export function isTimeOverlap(aStart: Date, aEnd: Date, bStart: Date, bEnd: Date): boolean {
+  return aStart < bEnd && bStart < aEnd;
+}
+
+/** 本地今天（YYYY-MM-DD）。 */
+function todayStr(): string {
+  const d = new Date();
+  const m = String(d.getMonth() + 1).padStart(2, '0');
+  const day = String(d.getDate()).padStart(2, '0');
+  return `${d.getFullYear()}-${m}-${day}`;
+}
+
+/** ISO datetime 字符串 → Date。 */
+function toDateTime(v: string): Date {
+  return new Date(v);
+}
+
+/** 单条计划项快照（item_list 元素）。 */
+function planItemSnapshot(i: Record<string, any>): Record<string, any> {
+  return {
+    svcId: i.svcId,
+    svcName: i.svcNameSnapshot,
+    svcCode: i.svcCodeSnapshot ?? null,
+    freqType: i.freqType ?? null,
+    freqValue: i.freqValue ?? null,
+    durationMin: i.durationMin ?? null,
+    photoTier: i.photoTier ?? 'free',
+    needCert: i.needCert ?? false,
+    isMedical: i.isMedical ?? false,
+  };
+}
+
+/**
+ * 工单（svc_order）业务服务。
+ *
+ * - generate：L2 校验（老人有 active 计划），从 plan_item 快照 item_list + need_photo，
+ *   order_status=to_assign；billable/price_snapshot/settle_period 留待 C3。
+ * - assign：按序校验 工单态(to_assign) → 老人待遇(L1, 1001) → 有计划(L2, 1002) →
+ *   当班(R9 pass-through) → 时间冲突(2001 硬拦) → 资质(1006 软提示)。派单后 order_status=assigned。
+ * - reassign：记 reschedule_log（改前/改后/时间/操作人），改派后重新校验时间冲突。
+ * - cancel：cancel_reason 必填。
+ * - today：当前登录护理员本人当日工单。
+ * - batchRecommend：只读推荐（同资质→历史服务过→距离近→负荷低，距离/负荷留 TODO），不自动派。
+ */
+@Injectable()
+export class OrderService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  /** 生成工单（to_assign）。 */
+  async generate(dto: GenerateOrderDto) {
+    const plan = await this.requireActivePlan(dto.planId, dto.elderId);
+    const planItems = await this.prisma.client.planItem.findMany({ where: { planId: plan.id } });
+    const itemList = planItems.map(planItemSnapshot);
+    const needPhoto = planItems.some((i) => i.photoTier === 'must');
+    const ctx = getRequestContext();
+
+    this.assertSlotRange(dto.timeSlotStart, dto.timeSlotEnd);
+
+    return this.prisma.client.order.create({
+      data: {
+        tenantCode: ctx?.tenantCode ?? '',
+        createdBy: ctx?.userId ?? null,
+        elderId: plan.elderId,
+        planId: plan.id,
+        serviceDate: toDateOnly(dto.serviceDate)!,
+        timeSlotStart: toDateTime(dto.timeSlotStart),
+        timeSlotEnd: toDateTime(dto.timeSlotEnd),
+        orderStatus: 'to_assign',
+        itemList,
+        needPhoto,
+        billable: true,
+      },
+    });
+  }
+
+  /** 派单（to_assign → assigned）。 */
+  async assign(dto: AssignOrderDto) {
+    const order = await this.requireOrder(dto.orderId);
+    if (order.orderStatus !== 'to_assign') {
+      throw new BusinessException(ErrorCodes.ORDER_STATUS_INVALID, '工单状态非待派单，不可派单', HttpStatus.BAD_REQUEST);
+    }
+    // L1：老人待遇校验（waiting_period 为垫付例外，允许派单）。
+    const elder = await this.prisma.client.elder.findFirst({ where: { id: order.elderId } });
+    if (!elder) {
+      throw new BusinessException(ErrorCodes.ELDER_NOT_FOUND, '老人档案不存在', HttpStatus.NOT_FOUND);
+    }
+    if (elder.treatStatus !== 'active' && elder.treatStatus !== 'waiting_period') {
+      throw new BusinessException(ErrorCodes.ORDER_STATUS_INVALID, '老人无有效待遇，不可派单（1001）', HttpStatus.BAD_REQUEST);
+    }
+    // L2：有计划校验。
+    await this.requireActivePlan(order.planId);
+    // 护理员当班（R9）。
+    const staff = await this.requireStaff(dto.assigneeId);
+    this.assertOnDuty(staff);
+    // 时间冲突（2001 硬拦）。
+    await this.assertNoConflict(order.id, dto.assigneeId, order.timeSlotStart, order.timeSlotEnd);
+    // 资质（1006 软提示）。
+    const qualificationCheck = this.qualificationCheck(order.itemList ?? [], staff);
+
+    const data: Record<string, any> = {
+      orderStatus: 'assigned',
+      assigneeId: dto.assigneeId,
+      assignTime: new Date(),
+      assignMode: dto.assignMode ?? 'manual',
+    };
+    if (qualificationCheck) data.qualificationCheck = qualificationCheck;
+    const updated = await this.prisma.client.order.update({ where: { id: order.id }, data });
+    if (qualificationCheck === 'warn') {
+      return { ...updated, warning: '护理员资质不满足要求，已软提示（1006）' };
+    }
+    return updated;
+  }
+
+  /** 调单：改派护理员与/或改时段，重新校验冲突并写 reschedule_log。 */
+  async reassign(id: string, dto: ReassignOrderDto) {
+    const order = await this.requireOrder(id);
+    if (order.orderStatus === 'cancelled') {
+      throw new BusinessException(ErrorCodes.ORDER_STATUS_INVALID, '已取消工单不可调单', HttpStatus.BAD_REQUEST);
+    }
+
+    const nextAssigneeId = dto.assigneeId ?? order.assigneeId ?? null;
+    const nextStart = dto.timeSlotStart ? toDateTime(dto.timeSlotStart) : order.timeSlotStart;
+    const nextEnd = dto.timeSlotEnd ? toDateTime(dto.timeSlotEnd) : order.timeSlotEnd;
+
+    if (nextAssigneeId) {
+      const staff = await this.requireStaff(nextAssigneeId);
+      this.assertOnDuty(staff);
+    }
+    await this.assertNoConflict(order.id, nextAssigneeId, nextStart, nextEnd);
+
+    const ctx = getRequestContext();
+    const entry = {
+      from: { assigneeId: order.assigneeId ?? null, timeSlotStart: order.timeSlotStart, timeSlotEnd: order.timeSlotEnd },
+      to: { assigneeId: nextAssigneeId, timeSlotStart: nextStart, timeSlotEnd: nextEnd },
+      reason: dto.reason ?? null,
+      operatorId: ctx?.userId ?? '',
+      at: new Date(),
+    };
+    const rescheduleLog = Array.isArray(order.rescheduleLog) ? [...order.rescheduleLog, entry] : [entry];
+
+    const data: Record<string, any> = {
+      assigneeId: nextAssigneeId,
+      timeSlotStart: nextStart,
+      timeSlotEnd: nextEnd,
+      rescheduleLog,
+    };
+    if (dto.assigneeId && dto.assigneeId !== order.assigneeId) {
+      data.assignTime = new Date();
+      data.assignMode = 'manual';
+    }
+    return this.prisma.client.order.update({ where: { id: order.id }, data });
+  }
+
+  /** 取消：cancel_reason 必填。 */
+  async cancel(id: string, dto: CancelOrderDto) {
+    if (!dto.cancelReason) {
+      throw new BusinessException(ErrorCodes.ORDER_STATUS_INVALID, '取消工单须填写原因', HttpStatus.BAD_REQUEST);
+    }
+    await this.requireOrder(id);
+    return this.prisma.client.order.update({
+      where: { id },
+      data: { orderStatus: 'cancelled', cancelReason: dto.cancelReason },
+    });
+  }
+
+  /** 工单详情。 */
+  detail(id: string) {
+    return this.requireOrder(id);
+  }
+
+  /** 当前登录护理员本人的当日工单（按 assignee_id + service_date）。 */
+  async today(q: TodayOrderQuery) {
+    const ctx = getRequestContext();
+    if (!ctx) return [];
+    const staff = await this.prisma.client.staff.findFirst({ where: { userId: ctx.userId } });
+    if (!staff) return [];
+    const serviceDate = q.serviceDate ? toDateOnly(q.serviceDate) : toDateOnly(todayStr());
+    return this.prisma.client.order.findMany({
+      where: { assigneeId: staff.id, serviceDate },
+      orderBy: { timeSlotStart: 'asc' },
+    });
+  }
+
+  /** 批量推荐：只读，不自动派。权重：同资质→历史服务过→距离近→负荷低（距离/负荷留 TODO）。 */
+  async batchRecommend(q: BatchRecommendQuery) {
+    const elder = await this.prisma.client.elder.findFirst({ where: { id: q.elderId } });
+    if (!elder) {
+      throw new BusinessException(ErrorCodes.ELDER_NOT_FOUND, '老人档案不存在', HttpStatus.NOT_FOUND);
+    }
+    const activePlan = await this.prisma.client.plan.findFirst({
+      where: { elderId: q.elderId, planStatus: 'active' },
+      orderBy: { createdAt: 'desc' },
+    });
+    const planItems = activePlan
+      ? await this.prisma.client.planItem.findMany({ where: { planId: activePlan.id } })
+      : [];
+    const needsCert = planItems.some((i) => i.needCert);
+    const staffs = await this.prisma.client.staff.findMany({});
+
+    const results = await Promise.all(
+      staffs.map(async (s) => {
+        const reasons: string[] = [];
+        let score = 0;
+        // 同资质：计划项需要持证时，护理员有证书则匹配。
+        if (needsCert) {
+          if (s.certNo || s.certType) {
+            score += 2;
+            reasons.push('资质匹配');
+          }
+        }
+        // 历史服务过该老人。
+        const servedCount = await this.prisma.client.order.count({
+          where: { assigneeId: s.id, elderId: q.elderId, orderStatus: { in: ['done', 'serving'] } },
+        });
+        if (servedCount > 0) {
+          score += 1;
+          reasons.push('历史服务过该老人');
+        }
+        // TODO(距离/负荷): 无距离与负荷模型，权重留待未来排班模型补充。
+        return { staffId: s.id, name: s.name, jobType: s.jobType, score, reasons };
+      }),
+    );
+    return results.sort((a, b) => b.score - a.score);
+  }
+
+  // ---- 内部校验 ----
+
+  private async requireOrder(id: string): Promise<Record<string, any>> {
+    const order = await this.prisma.client.order.findUnique({ where: { id } });
+    if (!order) {
+      throw new BusinessException(ErrorCodes.ORDER_NOT_FOUND, '工单不存在', HttpStatus.NOT_FOUND);
+    }
+    return order;
+  }
+
+  /** L2：计划须为 active（generate/assign 共用）；可选校验 elder 归属。 */
+  private async requireActivePlan(planId: string, elderId?: string): Promise<Record<string, any>> {
+    const plan = await this.prisma.client.plan.findUnique({ where: { id: planId } });
+    if (!plan) {
+      throw new BusinessException(ErrorCodes.PLAN_NOT_FOUND, '服务计划不存在', HttpStatus.NOT_FOUND);
+    }
+    if (elderId && plan.elderId !== elderId) {
+      throw new BusinessException(ErrorCodes.PLAN_NOT_FOUND, '服务计划不属于该老人', HttpStatus.BAD_REQUEST);
+    }
+    if (plan.planStatus !== 'active') {
+      throw new BusinessException(ErrorCodes.ORDER_STATUS_INVALID, '该老人无有效服务计划（1002）', HttpStatus.BAD_REQUEST);
+    }
+    return plan;
+  }
+
+  private async requireStaff(id: string): Promise<Record<string, any>> {
+    const staff = await this.prisma.client.staff.findFirst({ where: { id } });
+    if (!staff) {
+      throw new BusinessException(ErrorCodes.STAFF_NOT_FOUND, '人员不存在', HttpStatus.NOT_FOUND);
+    }
+    return staff;
+  }
+
+  /**
+   * R9「护理员当班」代理：C0 staff 无排班/当班字段，employStatus 亦无明确「在职」取值定义
+   * （src/staff/dto.ts 仅 IsString，无枚举/常量），故本轮 pass-through（不拦）。
+   * TODO(排班模型): 引入排班/当班模型后，在此校验护理员当班，非当班拒绝派单。
+   */
+  private assertOnDuty(_staff: Record<string, any>): void {
+    // no-op：本轮不校验当班
+  }
+
+  /** 同 assignee 时段重叠 → ORDER_CONFLICT（2001）硬拦；排除自身与已取消工单。 */
+  private async assertNoConflict(orderId: string, assigneeId: string | null, start: Date, end: Date) {
+    if (!assigneeId) return;
+    const existing = await this.prisma.client.order.findMany({
+      where: { assigneeId, orderStatus: { not: 'cancelled' } },
+    });
+    const conflict = existing.find(
+      (o) => o.id !== orderId && isTimeOverlap(start, end, o.timeSlotStart, o.timeSlotEnd),
+    );
+    if (conflict) {
+      throw new BusinessException(ErrorCodes.ORDER_CONFLICT, '该时段已有工单，时间冲突（2001）', HttpStatus.BAD_REQUEST);
+    }
+  }
+
+  /** 资质校验（1006 软提示）：item_list 有 needCert 项而护理员无证书 → warn，仍派。 */
+  private qualificationCheck(itemList: Record<string, any>[], staff: Record<string, any>): string | undefined {
+    const needsCert = itemList.some((i) => i.needCert);
+    if (needsCert && !staff.certNo && !staff.certType) {
+      return 'warn';
+    }
+    return undefined;
+  }
+
+  /** 时段止须晚于时段起。 */
+  private assertSlotRange(start: string, end: string) {
+    if (toDateTime(end) <= toDateTime(start)) {
+      throw new BadRequestException('时段止须晚于时段起');
+    }
+  }
+}