feat: 凭证生成、成本分析、AI问答、前端页面、集成测试与E2E测试

- 后端: 凭证生成引擎、金蝶导出器、凭证模板服务
- 后端: 成本分析服务、AI问答服务
- 后端: 科目映射CRUD API、分析API、QA API
- 后端: 集成测试(认证/任务/凭证) 49个测试全部通过
- 前端: 凭证管理、成本分析、导出中心、知识库、系统设置页面
- 前端: AuthGuard认证守卫、Dashboard AI聊天功能
- 前端: Playwright E2E测试 16 passed, 1 skipped
- 基础设施: Docker Compose、Nginx反向代理、.env.example
- 文档: 用户手册、管理员手册、发布检查清单

frontend/package.json

@@ -6,7 +6,9 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "test:e2e": "playwright test",
+    "test:e2e:ui": "playwright test --ui"
   },
   "dependencies": {
     "@fontsource/geist": "^5.2.9",
@@ -35,6 +37,7 @@
     "zustand": "^5.0.14"
   },
   "devDependencies": {
+    "@playwright/test": "^1.61.1",
     "@tailwindcss/postcss": "^4",
     "@types/node": "^20.19.43",
     "@types/react": "^19",