fix(c2): 个人项目库允许保存空库（清空）

- R12: PutElderSvcDto.svcIds 移除 @ArrayNotEmpty，空数组=清空
- 补测 put 空 svcIds 清空项目库

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/elder-svc/dto.ts

@@ -1,5 +1,5 @@
 import { ApiProperty } from '@nestjs/swagger';
-import { ArrayNotEmpty, IsArray, IsIn, IsNotEmpty, IsString } from 'class-validator';
+import { IsArray, IsIn, IsNotEmpty, IsString } from 'class-validator';
 
 /** 老人个人项目库整表覆盖入参：care_mode 为整库统一护理方式，svc_ids 落本机构 L4。 */
 export class PutElderSvcDto {
@@ -12,9 +12,8 @@ export class PutElderSvcDto {
   @IsIn(['inst_medical', 'inst_nursing', 'home_org', 'home_individual'])
   careMode!: string;
 
-  @ApiProperty({ description: '本机构 L4 项目库 svc_org.id 列表', type: [String] })
+  @ApiProperty({ description: '本机构 L4 项目库 svc_org.id 列表（可空，空数组=清空项目库）', type: [String] })
   @IsArray()
-  @ArrayNotEmpty()
   @IsString({ each: true })
   svcIds!: string[];
 }

src/elder-svc/elder-svc.service.spec.ts

@@ -101,6 +101,23 @@ describe('ElderSvcService', () => {
     expect(res).toHaveLength(2);
   });
 
+  it('put 空 svcIds 清空项目库：软删旧行、不写新行、返回空', async () => {
+    const elderSvcUpdateMany = vi.fn().mockResolvedValue({ count: 2 });
+    const elderSvcCreate = vi.fn();
+    const { service } = makeService({ elderSvcUpdateMany, elderSvcCreate });
+
+    const res = await runWithRequestContext(ctx, () =>
+      service.put('e1', { careMode: 'inst_medical', svcIds: [] }),
+    );
+
+    expect(elderSvcUpdateMany).toHaveBeenCalledWith({
+      where: { elderId: 'e1' },
+      data: { deletedAt: expect.any(Date) },
+    });
+    expect(elderSvcCreate).not.toHaveBeenCalled();
+    expect(res).toEqual([]);
+  });
+
   it('put 老人不存在 → ELDER_NOT_FOUND', async () => {
     const elderFindFirst = vi.fn().mockResolvedValue(null);
     const { service, elderSvcUpdateMany, elderSvcCreate } = makeService({ elderFindFirst });