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/components/layout/TopBar.vue

@@ -113,7 +113,7 @@
           <div v-for="kpi in knowledgeKpis" :key="kpi.label" class="kpi-chip" :style="{ '--chip-color': kpi.color }">
             <span class="chip-value">{{ kpi.value }}</span>
             <span class="chip-label">{{ kpi.label }}</span>
-            <span class="chip-delta" :class="kpi.trend">{{ kpi.meta }}</span>
+            <span v-if="kpi.meta" class="chip-delta" :class="kpi.trend">{{ kpi.meta }}</span>
           </div>
         </div>
       </template>
@@ -144,6 +144,10 @@ const props = defineProps({
     type: Object,
     default: () => null
   },
+  knowledgeSummary: {
+    type: Object,
+    default: () => null
+  },
   customRange: {
     type: Object,
     default: () => ({ start: '2024-07-06', end: '2024-07-12' })
@@ -187,12 +191,20 @@ const approvalKpis = [
   { label: '今日已处理', value: 28, unit: '单', meta: '通过率 86%', trend: 'up', color: '#10b981' }
 ]
 
-const knowledgeKpis = [
-  { label: '文档总数', value: '1,248', meta: '较上周 +68', trend: 'up', icon: 'mdi mdi-file-document-outline', color: '#10b981' },
-  { label: '文件夹总数', value: '36', meta: '较上周 +2', trend: 'up', icon: 'mdi mdi-folder-outline', color: '#3b82f6' },
-  { label: '问答总量', value: '8,562', meta: '较上周 +321', trend: 'up', icon: 'mdi mdi-comment-text-multiple-outline', color: '#8b5cf6' },
-  { label: '知识命中率', value: '87.3%', meta: '较上周 +1.2%', trend: 'up', icon: 'mdi mdi-bullseye-arrow', color: '#f59e0b' }
-]
+const knowledgeKpis = computed(() => {
+  const summary = props.knowledgeSummary ?? {}
+  const totalDocuments = Number(summary.totalDocuments ?? 0)
+
+  return [
+    {
+      label: '文档总数',
+      value: String(totalDocuments),
+      meta: '',
+      trend: 'up',
+      color: '#10b981'
+    }
+  ]
+})
 
 const employeeKpis = computed(() => {
   const summary = props.employeeSummary ?? {}