feat: 实现默认审批人和抄送人功能

- 后端新增 getDefaultApprovers 接口，从审批流程配置中获取默认审批人和抄送人
- 前端申请页面加载时自动获取并显示默认审批人和抄送人
- 添加默认审批流程配置：1个审批人(闫继光) + 2个抄送人(孟启、程丽敏)
- 移除后端 support 目录下的自定义 Db 和 Model 类，使用 Webman 官方实现
- 前端选择页面优化：优先从 sessionStorage 恢复，否则加载后端默认配置

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

frontend/src/pages/business-trip/apply.tsx

@@ -4,7 +4,8 @@ import { useTranslation } from 'react-i18next'
 import { DatePicker, Input, Toast, Dialog, TextArea, Selector } from 'antd-mobile'
 import { AddOutline, DeleteOutline } from 'antd-mobile-icons'
 import dayjs from 'dayjs'
-import { businessTripApi } from '../../services/api'
+import { businessTripApi, userApi } from '../../services/api'
+import { useUserStore } from '@/stores/user'
 import styles from './apply.module.css'
 
 interface ItineraryItem {
@@ -64,6 +65,7 @@ export default function BusinessTripApply() {
   ])
   const [approvers, setApprovers] = useState<ApproverItem[]>([])
   const [ccUsers, setCcUsers] = useState<ApproverItem[]>([])
+  const [defaultLoaded, setDefaultLoaded] = useState(false)
 
   // 手动保存草稿的函数
   const saveDraft = () => {
@@ -84,6 +86,40 @@ export default function BusinessTripApply() {
   // 使用 ref 来跟踪是否已经恢复过草稿
   const hasRestoredRef = useRef(false)
 
+  // 加载默认审批人和抄送人（仅在首次加载且没有草稿数据时）
+  useEffect(() => {
+    const loadDefaultApprovers = async () => {
+      // 如果已经有存储的草稿数据，不加载默认值
+      if (sessionStorage.getItem('businessTripDraft')) {
+        return
+      }
+      // 如果已经从选择页面返回，不加载默认值
+      if (location.state?.fromSelection) {
+        return
+      }
+      // 如果已经有存储的人员数据，不加载默认值
+      if (sessionStorage.getItem('selectedApprovers') || sessionStorage.getItem('selectedCc')) {
+        return
+      }
+
+      try {
+        const defaultData = await businessTripApi.getDefaultApprovers()
+        if (defaultData.approvers && defaultData.approvers.length > 0) {
+          setApprovers(defaultData.approvers)
+          sessionStorage.setItem('selectedApprovers', JSON.stringify(defaultData.approvers))
+        }
+        if (defaultData.cc_users && defaultData.cc_users.length > 0) {
+          setCcUsers(defaultData.cc_users)
+          sessionStorage.setItem('selectedCc', JSON.stringify(defaultData.cc_users))
+        }
+      } catch (error) {
+        console.error('Failed to load default approvers:', error)
+      }
+    }
+
+    loadDefaultApprovers()
+  }, [])
+
   // 处理从选择页面返回的数据和草稿恢复
   useEffect(() => {
     const fromSelection = location.state?.fromSelection

frontend/src/pages/business-trip/select-approver.tsx

@@ -3,7 +3,7 @@ import { useNavigate, useLocation } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'
 import { NavBar, SearchBar, Button, Toast, Empty } from 'antd-mobile'
 import { CheckOutline } from 'antd-mobile-icons'
-import { userApi } from '../../services/api'
+import { userApi, businessTripApi } from '../../services/api'
 import styles from './select-approver.module.css'
 
 interface UserItem {
@@ -34,16 +34,45 @@ export default function SelectUserPage() {
   const state = location.state as LocationState
 
   const [searchValue, setSearchValue] = useState('')
-  // 只从 sessionStorage 获取对应类型的数据
-  const getInitialSelected = () => {
-    const data = sessionStorage.getItem('selectedApprovers')
-    return data ? JSON.parse(data) : []
-  }
-  const [selectedUsers, setSelectedUsers] = useState<UserItem[]>(getInitialSelected())
+  const [selectedUsers, setSelectedUsers] = useState<UserItem[]>([])
   const [allUsers, setAllUsers] = useState<UserItem[]>([])
   const [loading, setLoading] = useState(false)
   const [hasMore, setHasMore] = useState(true)
   const [page, setPage] = useState(1)
+  const [defaultLoaded, setDefaultLoaded] = useState(false)
+
+  // 获取初始选中的用户（从 sessionStorage 或后端默认配置）
+  const loadInitialSelected = async () => {
+    const type = location.state?.type || 'approver'
+    const storageKey = type === 'approver' ? 'selectedApprovers' : 'selectedCc'
+
+    // 先尝试从 sessionStorage 获取
+    const storedData = sessionStorage.getItem(storageKey)
+    if (storedData) {
+      try {
+        const parsed = JSON.parse(storedData)
+        if (parsed.length > 0) {
+          setSelectedUsers(parsed)
+          return
+        }
+      } catch (e) {
+        console.error('Failed to parse stored data:', e)
+      }
+    }
+
+    // 如果没有存储的数据，从后端获取默认配置
+    try {
+      const defaultData = await businessTripApi.getDefaultApprovers()
+      const defaultUsers = type === 'approver'
+        ? (defaultData.approvers || [])
+        : (defaultData.cc_users || [])
+      setSelectedUsers(defaultUsers)
+    } catch (error: any) {
+      console.error('Failed to load default approvers:', error)
+      // 获取失败时设置为空数组
+      setSelectedUsers([])
+    }
+  }
 
   // 加载用户列表
   const loadUsers = async (pageNum: number = 1, isRefresh: boolean = false) => {
@@ -89,6 +118,7 @@ export default function SelectUserPage() {
   // 初始加载
   useEffect(() => {
     loadUsers(1, true)
+    loadInitialSelected()
   }, [])
 
   const isUserSelected = (userId: number) => {

frontend/src/services/api.ts

@@ -72,6 +72,9 @@ export const businessTripApi = {
 
   getDetail: (id: number) => api.get(`/business-trip/detail/${id}`),
 
+  // 获取默认审批人和抄送人
+  getDefaultApprovers: () => api.get('/business-trip/default-approvers'),
+
   create: (data: any) => api.post('/business-trip/create', data),
 
   update: (id: number, data: any) =>