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

web/src/services/api.js

@@ -1,4 +1,37 @@
 const API_BASE_STORAGE_KEY = 'x-financial-api-base-url'
+const AUTH_USER_STORAGE_KEY = 'x-financial-auth-user'
+
+function readCurrentUserHeaders() {
+  if (typeof window === 'undefined') {
+    return {}
+  }
+
+  const raw = window.sessionStorage.getItem(AUTH_USER_STORAGE_KEY)
+  if (!raw) {
+    return {}
+  }
+
+  try {
+    const payload = JSON.parse(raw)
+    const username = String(payload?.username || '').trim()
+    const name = String(payload?.name || username).trim()
+    const roleCodes = Array.isArray(payload?.roleCodes) ? payload.roleCodes.filter(Boolean) : []
+    const isAdmin = Boolean(payload?.isAdmin)
+
+    if (!username && !name) {
+      return {}
+    }
+
+    return {
+      'x-auth-username': username,
+      'x-auth-name': name,
+      'x-auth-role-codes': roleCodes.join(','),
+      'x-auth-is-admin': String(isAdmin)
+    }
+  } catch {
+    return {}
+  }
+}
 
 function normalizeApiBaseUrl(value) {
   return String(value || '/api/v1').replace(/\/$/, '')
@@ -66,22 +99,50 @@ function buildUrl(path) {
 }
 
 export async function apiRequest(path, options = {}) {
+  const {
+    contentType = 'application/json',
+    responseType = 'json',
+    headers: customHeaders,
+    ...fetchOptions
+  } = options
+
+  const headers = {
+    ...readCurrentUserHeaders(),
+    ...(customHeaders || {})
+  }
+
+  if (contentType !== null && typeof headers['Content-Type'] === 'undefined') {
+    headers['Content-Type'] = contentType
+  }
+
   let response
 
   try {
     response = await fetch(buildUrl(path), {
-      headers: {
-        'Content-Type': 'application/json',
-        ...(options.headers || {})
-      },
-      ...options
+      ...fetchOptions,
+      headers
     })
   } catch {
     throw new Error('无法连接 FastAPI 后端服务，请确认后端已启动且浏览器可访问后端端口。')
   }
 
-  let payload = null
+  if (responseType === 'blob') {
+    if (!response.ok) {
+      let payload = null
 
+      try {
+        payload = await response.json()
+      } catch {
+        payload = null
+      }
+
+      throw new Error(payload?.detail || '接口请求失败，请稍后重试。')
+    }
+
+    return response.blob()
+  }
+
+  let payload = null
   try {
     payload = await response.json()
   } catch {