refactor: split project into web and server directories

- Move frontend to web/ directory
- Add server/ directory for backend
- Restructure project for前后端分离架构

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/src/composables/useAppShell.js

@@ -0,0 +1,169 @@
+import { computed, ref } from 'vue'
+
+import { useNavigation, navItems } from './useNavigation.js'
+import { useRequests } from './useRequests.js'
+import { useChat } from './useChat.js'
+import { useToast } from './useToast.js'
+import { documents } from '../data/requests.js'
+
+export function useAppShell() {
+  const loggedIn = ref(false)
+  const travelCreateMode = ref(false)
+  const detailMode = ref(false)
+  const selectedTravelRequest = ref(null)
+  const smartEntryOpen = ref(false)
+  const smartEntryContext = ref({ prompt: '', source: 'requests', request: null })
+  const smartEntrySessionId = ref(0)
+
+  const { activeView, currentView, setView } = useNavigation()
+  const { requests, search, filters, ranges, activeRange, filteredRequests, approveRequest, rejectRequest } = useRequests()
+  const { messages, draft, uploadedFiles, messageList, activeCase, prompts, sendMessage, handleUpload, openChat, openNewChat } = useChat(activeView)
+  const { toastText, toast } = useToast()
+
+  const docSearch = ref('')
+  const customRange = ref({ start: '2024-07-06', end: '2024-07-12' })
+  const travelPrompts = ['帮我提交出差申请', '预订机票', '预订酒店', '预订火车票', '查询差旅政策']
+
+  const topBarView = computed(() => {
+    if (detailMode.value) {
+      return {
+        title: '差旅报销详情',
+        desc: '查看报销单据详情、票据识别与审批进度'
+      }
+    }
+    return currentView.value
+  })
+
+  const filteredDocuments = computed(() => {
+    const key = docSearch.value.trim().toLowerCase()
+    return documents.filter((doc) => {
+      const matchesSearch = !key || `${doc.id}${doc.applicant}${doc.destination}${doc.type}`.toLowerCase().includes(key)
+      return matchesSearch
+    })
+  })
+
+  function handleLogin(credentials) {
+    if (credentials.username && credentials.password) {
+      loggedIn.value = true
+    }
+  }
+
+  function handleRecoverPassword() {
+    toast('请联系系统管理员重置密码。')
+  }
+
+  function handleSsoLogin() {
+    toast('SSO 登录通道建设中。')
+  }
+
+  function handleApprove(request) {
+    const msg = approveRequest(request)
+    toast(msg)
+  }
+
+  function handleReject(request) {
+    const msg = rejectRequest(request)
+    toast(msg)
+  }
+
+  function handleNavigate(view) {
+    travelCreateMode.value = false
+    detailMode.value = false
+    selectedTravelRequest.value = null
+    smartEntryOpen.value = false
+    setView(view)
+  }
+
+  function handleOpenChat(request) {
+    travelCreateMode.value = false
+    openChat(request)
+  }
+
+  function openTravelCreate() {
+    smartEntryOpen.value = true
+    travelCreateMode.value = false
+    detailMode.value = false
+    selectedTravelRequest.value = null
+    smartEntryContext.value = { prompt: '', source: 'topbar', request: null }
+    smartEntrySessionId.value += 1
+  }
+
+  function openSmartEntry(payload = {}) {
+    smartEntryOpen.value = true
+    travelCreateMode.value = false
+    if (payload.source !== 'detail') {
+      detailMode.value = false
+      selectedTravelRequest.value = null
+    }
+    smartEntryContext.value = {
+      prompt: payload.prompt ?? '',
+      source: payload.source ?? 'workbench',
+      request: payload.request ?? selectedTravelRequest.value
+    }
+    smartEntrySessionId.value += 1
+  }
+
+  function closeSmartEntry() {
+    smartEntryOpen.value = false
+  }
+
+  function openRequestDetail(request) {
+    selectedTravelRequest.value = request
+    detailMode.value = true
+    activeView.value = 'requests'
+  }
+
+  function closeRequestDetail() {
+    detailMode.value = false
+    selectedTravelRequest.value = null
+  }
+
+  return {
+    activeCase,
+    activeRange,
+    activeView,
+    closeRequestDetail,
+    closeSmartEntry,
+    currentView,
+    customRange,
+    detailMode,
+    docSearch,
+    draft,
+    filteredDocuments,
+    filteredRequests,
+    filters,
+    handleApprove,
+    handleLogin,
+    handleNavigate,
+    handleOpenChat,
+    handleRecoverPassword,
+    handleReject,
+    handleSsoLogin,
+    handleUpload,
+    loggedIn,
+    messageList,
+    messages,
+    navItems,
+    openChat,
+    openNewChat,
+    openRequestDetail,
+    openSmartEntry,
+    openTravelCreate,
+    prompts,
+    ranges,
+    requests,
+    search,
+    selectedTravelRequest,
+    sendMessage,
+    setView,
+    smartEntryContext,
+    smartEntryOpen,
+    smartEntrySessionId,
+    toast,
+    toastText,
+    topBarView,
+    travelCreateMode,
+    travelPrompts,
+    uploadedFiles
+  }
+}