feat: 完善前后端核心功能模块

后端:
- 新增认证(auth)、任务(tasks)、映射(mappings)、对账(reconciliation)、异常(exceptions)、导出(exports) API
- 新增核心模块: database, security, permissions, tenant, exceptions, error_handlers
- 新增数据模型: user, company, reconciliation_task, field_mapping, uploaded_file 等
- 新增服务层: ai_recognizer, file_parser, file_storage, mapping, reconciliation 等
- 添加数据库迁移脚本

前端:
- 新增登录页面和仪表盘页面
- 新增任务列表、任务详情、字段映射页面
- 新增异常处理页面和规则设置页面
- 新增 API 代理路由 /api/[...path]
- 新增 UI 组件库 (button, card, dialog, input, table 等)
- 新增 auth 组件 (ProtectedRoute, PermissionGate)
- 新增 layout 组件 (Header, Sidebar)
- 新增 mapping 组件 (FieldMappingTable, AISuggestionPanel)
- 新增 API 客户端和 hooks (useAsync, useToast, usePermission 等)
- 新增状态管理 (auth-store, company-store, ui-store)
- 集成 Tailwind CSS 和 shadcn/ui 组件库

其他:
- 添加 Alembic 数据库迁移配置
- 添加初始化示例数据脚本
- 更新项目文档

frontend/package.json

@@ -9,12 +9,19 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "@fontsource/geist": "^5.2.9",
+    "@fontsource/ibm-plex-sans": "^5.2.8",
     "@hookform/resolvers": "^5.4.0",
+    "@radix-ui/react-dialog": "^1.1.18",
+    "@radix-ui/react-select": "^2.3.2",
+    "@radix-ui/react-slot": "^1.3.0",
+    "@radix-ui/react-tabs": "^1.1.16",
     "axios": "^1.18.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "date-fns": "^4.4.0",
     "lucide-react": "^1.23.0",
+    "motion": "^12.42.2",
     "next": "16.2.10",
     "react": "19.2.4",
     "react-dom": "19.2.4",
@@ -22,6 +29,7 @@
     "react-hook-form": "^7.81.0",
     "recharts": "^3.9.2",
     "tailwind-merge": "^3.6.0",
+    "tailwindcss-animate": "^1.0.7",
     "zod": "^4.4.3",
     "zustand": "^5.0.14"
   },