feat: 新增归档中心页面并完善知识库与报销查询能力

新增前端归档中心视图及相关工具函数，扩充知识库文档分类和
提取器支持多种格式，增强编排器报销查询的多维度检索，优
化本体规则和用户代理审核消息，前端完善报销创建和审批详
情交互细节，补充单元测试覆盖。

web/src/views/scripts/PoliciesView.js

@@ -27,7 +27,10 @@ import {
   shouldRenderOnlyOfficePreview
 } from './knowledgePreviewMode.js'
 import { resolveKnowledgePreviewLayoutState } from './knowledgePreviewLayout.js'
-import { resolveInitialKnowledgeFolder } from './knowledgeFolderSelection.js'
+import {
+  resolveInitialKnowledgeFolder,
+  resolveKnowledgeFolderIcon
+} from './knowledgeFolderSelection.js'
 import { buildOnlyOfficePreviewConfig } from './onlyOfficePreviewConfig.js'
 
 const KNOWLEDGE_POLL_INTERVAL_MS = 5000
@@ -663,11 +666,12 @@ export default {
       previewLoading,
       shouldRenderOnlyOffice,
       shouldRenderOnlyOfficeHostNode,
-      selectDocument,
-      selectPreviewPage,
-      selectedDocument,
-      syncingFolder,
-      totalCount,
+      selectDocument,
+      selectPreviewPage,
+      selectedDocument,
+      resolveKnowledgeFolderIcon,
+      syncingFolder,
+      totalCount,
       totalPages,
       triggerUpload,
       uploadHint,