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/ApprovalCenterView.js

@@ -6,6 +6,11 @@ import { useApprovalInbox } from '../../composables/useApprovalInbox.js'
 import { useSystemState } from '../../composables/useSystemState.js'
 import { fetchApprovalExpenseClaims } from '../../services/reimbursements.js'
 import { listPendingApprovalRequests } from '../../utils/approvalInbox.js'
+import {
+  filterActionableRiskFlags,
+  isRiskSummaryWithRisk,
+  normalizeRiskFlagTone
+} from '../../utils/riskFlags.js'
 import TravelRequestDetailView from '../TravelRequestDetailView.vue'
 
 const DEFAULT_SLA_HOURS = 24
@@ -37,10 +42,9 @@ function formatCurrency(value) {
 }
 
 function resolveRiskTone(riskFlags, riskSummary) {
-  if (Array.isArray(riskFlags)) {
-    const severities = riskFlags
-      .map((item) => String(item?.severity || '').trim().toLowerCase())
-      .filter(Boolean)
+  const actionableFlags = filterActionableRiskFlags(riskFlags)
+  if (actionableFlags.length) {
+    const severities = actionableFlags.map((item) => normalizeRiskFlagTone(item)).filter(Boolean)
 
     if (severities.includes('high')) {
       return 'high'
@@ -53,7 +57,7 @@ function resolveRiskTone(riskFlags, riskSummary) {
     }
   }
 
-  if (String(riskSummary || '').trim() && String(riskSummary || '').trim() !== '无') {
+  if (isRiskSummaryWithRisk(riskSummary)) {
     return 'medium'
   }