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/tests/api-request.test.mjs

@@ -0,0 +1,99 @@
+import assert from 'node:assert/strict'
+
+import { apiRequest } from '../src/services/api.js'
+
+async function testUsesCustomContentTypeHeader() {
+  let capturedOptions = null
+
+  global.fetch = async (_url, options) => {
+    capturedOptions = options
+    return {
+      ok: true,
+      async json() {
+        return { ok: true }
+      }
+    }
+  }
+
+  await apiRequest('/knowledge/documents', {
+    method: 'POST',
+    body: 'payload',
+    contentType: 'application/octet-stream'
+  })
+
+  assert.equal(capturedOptions.headers['Content-Type'], 'application/octet-stream')
+}
+
+async function testSupportsBlobResponses() {
+  const blob = new Blob(['preview'])
+
+  global.fetch = async () => ({
+    ok: true,
+    async blob() {
+      return blob
+    },
+    async json() {
+      throw new Error('json parser should not be used for blob responses')
+    }
+  })
+
+  const payload = await apiRequest('/knowledge/documents/demo/content', {
+    responseType: 'blob',
+    contentType: null
+  })
+
+  assert.equal(payload, blob)
+}
+
+async function testInjectsAuthenticatedUserHeaders() {
+  const sessionStorage = new Map([
+    [
+      'x-financial-auth-user',
+      JSON.stringify({
+        username: 'admin',
+        name: '系统管理员',
+        roleCodes: ['manager'],
+        isAdmin: true
+      })
+    ]
+  ])
+
+  global.window = {
+    sessionStorage: {
+      getItem(key) {
+        return sessionStorage.get(key) ?? null
+      }
+    }
+  }
+
+  let capturedOptions = null
+
+  global.fetch = async (_url, options) => {
+    capturedOptions = options
+    return {
+      ok: true,
+      async json() {
+        return { ok: true }
+      }
+    }
+  }
+
+  await apiRequest('/knowledge/library')
+
+  assert.equal(capturedOptions.headers['x-auth-username'], 'admin')
+  assert.equal(capturedOptions.headers['x-auth-name'], '系统管理员')
+  assert.equal(capturedOptions.headers['x-auth-role-codes'], 'manager')
+  assert.equal(capturedOptions.headers['x-auth-is-admin'], 'true')
+}
+
+async function run() {
+  await testUsesCustomContentTypeHeader()
+  await testSupportsBlobResponses()
+  await testInjectsAuthenticatedUserHeaders()
+  console.log('api-request tests passed')
+}
+
+run().catch((error) => {
+  console.error(error)
+  process.exit(1)
+})

web/tests/onlyoffice-service.test.mjs

@@ -0,0 +1,13 @@
+import assert from 'node:assert/strict'
+
+import { buildOnlyOfficeScriptUrl } from '../src/services/onlyoffice.js'
+
+function run() {
+  assert.equal(
+    buildOnlyOfficeScriptUrl('http://127.0.0.1:8082/'),
+    'http://127.0.0.1:8082/web-apps/apps/api/documents/api.js'
+  )
+  console.log('onlyoffice service tests passed')
+}
+
+run()

web/tests/policies-preview-formatters.test.mjs

@@ -0,0 +1,69 @@
+import assert from 'node:assert/strict'
+
+import {
+  buildExcelPreviewTable,
+  buildPreviewMetaLine,
+  buildPreviewSecondaryMetaLine
+} from '../src/views/scripts/policiesPreviewFormatters.js'
+
+function testBuildPreviewMetaLineUsesRealDocumentFields() {
+  const document = {
+    summary: '财务知识库 · XLSX · 10.9 KB',
+    time: '2026-05-09 12:30'
+  }
+
+  assert.deepEqual(buildPreviewMetaLine(document), ['财务知识库 · XLSX · 10.9 KB', '2026-05-09 12:30'])
+}
+
+function testBuildPreviewSecondaryMetaLineForExcelUsesSubtitleAndStats() {
+  const document = {
+    previewKind: 'table',
+    previewPages: [
+      {
+        subtitle: '表格内容预览',
+        stats: [
+          { label: '工作表数量', value: '4' },
+          { label: '预览行数', value: '7' },
+          { label: '文件大小', value: '10.9 KB' }
+        ]
+      },
+      {
+        subtitle: '第二页签预览',
+        stats: [
+          { label: '工作表数量', value: '4' },
+          { label: '预览行数', value: '3' }
+        ]
+      }
+    ]
+  }
+
+  assert.deepEqual(buildPreviewSecondaryMetaLine(document, document.previewPages[0]), ['表格内容预览', '工作表数量 4', '预览行数 7'])
+  assert.deepEqual(buildPreviewSecondaryMetaLine(document, document.previewPages[1]), ['第二页签预览', '工作表数量 4', '预览行数 3'])
+}
+
+function testBuildExcelPreviewTableParsesHeaderAndRows() {
+  const page = {
+    blocks: [
+      { heading: '第 1 行', lines: ['日期 | 部门 | 金额 | 备注'] },
+      { heading: '第 2 行', lines: ['2026-05-01 | 财务部 | 300 | 差旅'] },
+      { heading: '第 3 行', lines: ['2026-05-02 | 行政部 | 120 | '] }
+    ]
+  }
+
+  assert.deepEqual(buildExcelPreviewTable(page), {
+    headers: ['日期', '部门', '金额', '备注'],
+    rows: [
+      ['2026-05-01', '财务部', '300', '差旅'],
+      ['2026-05-02', '行政部', '120', '']
+    ]
+  })
+}
+
+function run() {
+  testBuildPreviewMetaLineUsesRealDocumentFields()
+  testBuildPreviewSecondaryMetaLineForExcelUsesSubtitleAndStats()
+  testBuildExcelPreviewTableParsesHeaderAndRows()
+  console.log('policies preview formatter tests passed')
+}
+
+run()