fix: 前端表格行类型断言修复并补充 psycopg-pool 依赖

- 审批/项目/租户/用户设置等视图新增 asXxx 类型断言辅助函数
- search-fields 由字符串改为数组传参
- backend 依赖新增 psycopg-pool，Dockerfile 依赖校验同步更新

frontend/src/views/approvals/ApprovalInstanceView.vue

@@ -3,7 +3,8 @@ import { onMounted, reactive, ref } from 'vue'
 import { ElMessage } from 'element-plus'
 import DataTablePage from '@/components/DataTablePage.vue'
 import { getApprovalInstances, decideApproval, type ApprovalInstance } from '@/api/modules/approval'
-import { getUsers, type SystemUser } from '@/api/modules/system'
+import { getUsers } from '@/api/modules/system'
+import type { SystemUser } from '@/types'
 
 const loading = ref(false)
 const instances = ref<ApprovalInstance[]>([])
@@ -48,6 +49,10 @@ function openDecide(inst: ApprovalInstance) {
   showDecide.value = true
 }
 
+function asApprovalInstance(row: unknown): ApprovalInstance {
+  return row as ApprovalInstance
+}
+
 async function submitDecision() {
   if (!current.value) return
   if (!decision.value.approver_id) {
@@ -72,7 +77,7 @@ onMounted(() => {
 
 <template>
   <div class="page">
-    <DataTablePage title="审批实例" :data="instances" :loading="loading" searchable search-fields="resource_type,resource_id">
+    <DataTablePage title="审批实例" :data="instances" :loading="loading" searchable :search-fields="['resource_type', 'resource_id']">
       <template #toolbar-extra>
         <el-select v-model="statusFilter" placeholder="状态" clearable style="width: 140px" @change="load">
           <el-option v-for="s in statusOptions" :key="s.value" :label="s.label" :value="s.value" />
@@ -82,14 +87,14 @@ onMounted(() => {
         <el-table-column prop="resource_type" label="资源类型" min-width="120" />
         <el-table-column prop="resource_id" label="资源 ID" min-width="160" show-overflow-tooltip />
         <el-table-column prop="applicant_id" label="申请人" min-width="120">
-          <template #default="{ row }">{{ userName(row.applicant_id) }}</template>
+          <template #default="{ row }">{{ userName(asApprovalInstance(row).applicant_id) }}</template>
         </el-table-column>
         <el-table-column prop="status" label="状态" min-width="100" />
         <el-table-column prop="current_step" label="当前步骤" min-width="100" />
         <el-table-column prop="create_time" label="创建时间" min-width="180" />
       </template>
       <template #actions="{ row }">
-        <el-button v-if="row.status === 'pending'" link type="primary" @click="openDecide(row)">审批</el-button>
+        <el-button v-if="asApprovalInstance(row).status === 'pending'" link type="primary" @click="openDecide(asApprovalInstance(row))">审批</el-button>
       </template>
     </DataTablePage>
     <el-dialog v-model="showDecide" title="审批决策" width="480px">