feat: 完善知识库、策略预览与OnlyOffice集成

## 配置与环境
- .env.example: 更新环境变量配置
- docker-compose.yml: 完善Docker编排配置
- docker/README.md: 更新Docker文档

## 后端知识库模块
- endpoints/knowledge.py: 增强知识库API端点
- schemas/knowledge.py: 扩展知识库数据模型
- services/knowledge.py: 完善知识库业务逻辑
- config.py: 优化配置管理
- storage/knowledge/.index.json: 更新知识库索引

## 前端功能
- api.js: 完善API服务层
- knowledge.js: 优化知识库服务
- onlyoffice.js: 新增OnlyOffice文档服务集成
- TopBar.vue: 优化顶部导航栏
- PoliciesView.vue: 完善策略视图
- AppShellRouteView.vue: 新增应用外壳路由视图
- views/scripts/PoliciesView.js: 优化策略脚本
- policiesPreviewFormatters.js: 新增策略预览格式化工具

## 样式
- policies-view.css: 完善策略页样式

## 测试
- api-request.test.mjs: API请求测试
- onlyoffice-service.test.mjs: OnlyOffice服务测试
- policies-preview-formatters.test.mjs: 策略预览格式化测试

server/storage/knowledge/.index.json

@@ -1,4 +1,19 @@
 {
   "version": 1,
-  "documents": []
+  "documents": [
+    {
+      "id": "fde293670eac4ae2b90a80eeb9f27b5b",
+      "folder": "财务知识库",
+      "original_name": "差旅费季度报销258878.xlsx",
+      "stored_name": "fde293670eac4ae2b90a80eeb9f27b5b__差旅费季度报销258878.xlsx",
+      "mime_type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+      "extension": "xlsx",
+      "size_bytes": 11123,
+      "sha256": "ea02e59d3a22a4a02284172acce3fd4c6367a26f1a4fd196dc4f65afed1bd4c5",
+      "created_at": "2026-05-09T03:33:44.101489+00:00",
+      "updated_at": "2026-05-09T03:33:44.101489+00:00",
+      "uploaded_by": "admin",
+      "version_number": 1
+    }
+  ]
 }