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/utils/riskFlags.js

@@ -0,0 +1,107 @@
+const NO_RISK_SUMMARY_VALUES = new Set(['无', '暂无异常', '无异常', '暂无风险'])
+const NON_RISK_SOURCES = new Set([
+  'manual_approval',
+  'finance_approval',
+  'approval',
+  'approval_log',
+  'expense_claim_approval',
+  'expense_claim_finance_approval'
+])
+const NON_RISK_EVENTS = new Set([
+  'expense_claim_approval',
+  'expense_claim_finance_approval'
+])
+const NON_RISK_TONES = new Set(['info', 'pass', 'success', 'approved', 'ok', 'none'])
+const RISK_SOURCES = new Set([
+  'attachment_analysis',
+  'submission_review',
+  'manual_return',
+  'platform_risk',
+  'policy_review',
+  'scene_policy_review'
+])
+
+function normalizeText(value) {
+  return String(value || '').trim()
+}
+
+function normalizeKey(value) {
+  return normalizeText(value).toLowerCase()
+}
+
+function isApprovalOnlyText(value) {
+  const text = normalizeText(value)
+  if (!text) {
+    return true
+  }
+
+  return (
+    /^(同意|通过|审批通过|审核通过|已同意|无意见)$/.test(text)
+    || /已审批通过/.test(text)
+    || /已完成财务审核/.test(text)
+    || /进入归档入账/.test(text)
+    || /流转至/.test(text)
+  )
+}
+
+export function normalizeRiskFlagTone(flag) {
+  if (!flag || typeof flag !== 'object') {
+    return normalizeText(flag) ? 'medium' : 'none'
+  }
+
+  const tone = normalizeKey(flag.severity || flag.tone || flag.level || flag.riskTone || flag.risk_tone)
+  if (['high', 'medium', 'low'].includes(tone)) {
+    return tone
+  }
+  if (NON_RISK_TONES.has(tone)) {
+    return 'none'
+  }
+
+  const source = normalizeKey(flag.source)
+  if (source === 'manual_return') {
+    return 'medium'
+  }
+  if (RISK_SOURCES.has(source)) {
+    return 'medium'
+  }
+
+  const riskText = normalizeText(flag.message || flag.reason || flag.summary || flag.label || flag.description || flag.title)
+  if (riskText && !isApprovalOnlyText(riskText)) {
+    return 'medium'
+  }
+
+  return 'none'
+}
+
+export function isActionableRiskFlag(flag) {
+  if (!flag || typeof flag !== 'object') {
+    const text = normalizeText(flag)
+    return Boolean(text && !isApprovalOnlyText(text))
+  }
+
+  const source = normalizeKey(flag.source)
+  const eventType = normalizeKey(flag.event_type || flag.eventType)
+  if (NON_RISK_SOURCES.has(source) || NON_RISK_EVENTS.has(eventType)) {
+    return false
+  }
+
+  const tone = normalizeRiskFlagTone(flag)
+  if (tone === 'high' || tone === 'medium' || tone === 'low') {
+    return true
+  }
+
+  return false
+}
+
+export function filterActionableRiskFlags(riskFlags) {
+  return (Array.isArray(riskFlags) ? riskFlags : []).filter((flag) => isActionableRiskFlag(flag))
+}
+
+export function isRiskSummaryWithRisk(riskSummary) {
+  const summary = normalizeText(riskSummary)
+  if (!summary || NO_RISK_SUMMARY_VALUES.has(summary) || isApprovalOnlyText(summary)) {
+    return false
+  }
+
+  return true
+}