feat: 支局长/分管领导可为任意客户经理代填记录

后端:
- 5个模块的 Create/Update schema 新增可选 manager_id 字段
- POST 端点: director/leader 可指定 manager_id，manager 角色自动用自身
- PUT 端点: director/leader 可修改 manager_id，manager 角色禁止修改

前端（移动端+桌面端共10个页面）:
- 支局长/领导可见「客户经理」下拉选择框
- 创建和编辑时均可指定记录归属的客户经理
- 涵盖今日拜访、今日纪要、工作计划、商机跟单、要客拜访五个模块

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

frontend/src/views/mobile/WorkPlanForm.vue

@@ -5,19 +5,29 @@ import { ElMessage } from 'element-plus'
 import { todayStr } from '@/utils'
 import { workPlansApi } from '@/api/workPlans'
 import { customersApi } from '@/api/customers'
+import { useAuthStore } from '@/stores/auth'
+import api from '@/api/index'
 
 const router = useRouter()
+const auth = useAuthStore()
 const submitLoading = ref(false)
 const customers = ref<any[]>([])
+const allManagers = ref<any[]>([])
 
 const form = ref({
   customer_id: '',
   plan_content: '',
   plan_date: todayStr(),
   status: '计划中',
+  manager_id: auth.userId || '',
 })
 
-onMounted(() => { loadCustomers() })
+onMounted(() => {
+  loadCustomers()
+  if (auth.isDirector || auth.isLeader) {
+    api.get('/users/', { params: { role: 'manager' } }).then(r => { allManagers.value = r.data }).catch(() => {})
+  }
+})
 
 async function loadCustomers(q?: string) {
   try {
@@ -65,6 +75,13 @@ async function handleSubmit() {
         </el-select>
       </el-form-item>
 
+      <el-form-item v-if="auth.isDirector || auth.isLeader">
+        <template #label><span class="form-label">客户经理</span></template>
+        <el-select v-model="form.manager_id" filterable placeholder="选择客户经理" style="width:100%">
+          <el-option v-for="m in allManagers" :key="m.id" :label="m.name" :value="m.id" />
+        </el-select>
+      </el-form-item>
+
       <el-form-item>
         <template #label><span class="form-label">工作计划</span></template>
         <el-input v-model="form.plan_content" type="textarea" :rows="4" placeholder="描述下周工作计划..." />