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/src/app/schemas/knowledge.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import Any
+
 from pydantic import BaseModel, Field
 
 
@@ -51,6 +53,15 @@ class KnowledgeDocumentDetailRead(KnowledgeDocumentRead):
     previewPages: list[KnowledgePreviewPageRead] = Field(default_factory=list)
 
 
+class KnowledgeOnlyOfficeConfigRead(BaseModel):
+    documentServerUrl: str
+    config: dict[str, Any] = Field(default_factory=dict)
+
+
+class KnowledgeOnlyOfficeCallbackRead(BaseModel):
+    error: int = 0
+
+
 class KnowledgeLibraryRead(BaseModel):
     folders: list[KnowledgeFolderRead] = Field(default_factory=list)
     documents: list[KnowledgeDocumentRead] = Field(default_factory=list)