fix(c3): 结转垫付期服务按待遇状态门控（active 才展示）

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

src/components/elder-detail.vue

@@ -50,6 +50,7 @@
         <el-button v-permission="'plan:create'" type="primary" @click="openPlanForm">制定计划</el-button>
       </div>
 
+      <template v-if="elder?.treatStatus === 'active'">
         <el-divider content-position="left">垫付台账</el-divider>
         <div v-loading="prepaidLoading">
           <div class="mb-sm flex items-center">
@@ -90,6 +91,7 @@
           </el-table>
           <el-empty v-else description="暂无垫付记录" :image-size="60" />
         </div>
+      </template>
 
       <div v-if="!isTerminal" v-permission="'elder:status-change'">
         <el-divider content-position="left">状态变更</el-divider>