feat: 重构报销单服务并完善前端提交与审核交互

重构 expense_claims 服务模块结构并优化差旅票据审核逻辑，
增强用户代理服务的票据类型识别，前端报销创建页面拆分为
附件模型和会话模型模块，重构提交编排器和草稿关联确认流
程，更新知识库索引，补充单元测试。

web/src/views/scripts/travelReimbursementReviewModel.js

@@ -224,14 +224,22 @@ export function resolveReviewMissingSlotCards(reviewPayload) {
 
 export function resolveReviewExtraMissingLabels(reviewPayload) {
   const labels = Array.isArray(reviewPayload?.missing_slots)
-    ? reviewPayload.missing_slots.map((item) => String(item || '').trim()).filter(Boolean)
+    ? reviewPayload.missing_slots
+      .map((item) => {
+        if (item && typeof item === 'object') {
+          return String(item.label || item.title || item.key || '').trim()
+        }
+        return String(item || '').trim()
+      })
+      .filter(Boolean)
     : []
   if (!labels.length) return []
 
   const slotLabels = new Set(
-    (Array.isArray(reviewPayload?.slot_cards) ? reviewPayload.slot_cards : [])
-      .map((item) => String(item?.label || item?.key || '').trim())
-      .filter(Boolean)
+    (Array.isArray(reviewPayload?.slot_cards) ? reviewPayload.slot_cards : []).flatMap((item) => [
+      String(item?.label || '').trim(),
+      String(item?.key || '').trim()
+    ]).filter(Boolean)
   )
   return labels.filter((label) => !slotLabels.has(label))
 }
@@ -1239,23 +1247,66 @@ function buildReviewPlainFollowupItem(item, pendingMode) {
   }
 }
 
+const REVIEW_PENDING_SUMMARY_TEMPLATES = [
+  ({ issueSummary }) => `当前还有 ${issueSummary}。请核查对话中的文字说明；如果想先暂存，也可以点击对话文字中的“草稿”。`,
+  ({ issueSummary }) => `我这边看到还有 ${issueSummary}，建议先把下方内容核对一下；暂时不处理也没关系，可以点击“草稿”先保存。`,
+  ({ issueSummary }) => `下方还有 ${issueSummary}，需要你确认。信息没补齐前可以先核查说明，后续需要暂存时点“草稿”。`,
+  ({ issueSummary }) => `这笔报销还有 ${issueSummary}，尚未完全确认。请先看一下下面的补充项；需要中途保存时，可以点“草稿”。`,
+  ({ issueSummary }) => `目前还有 ${issueSummary}。你可以先按下面的提示补充，也可以稍后再处理，点击“草稿”即可暂存当前信息。`,
+  ({ issueSummary }) => `还有 ${issueSummary}，建议先核对下面说明；如果票据或金额暂时不全，可以通过“草稿”保留当前进度。`,
+  ({ issueSummary }) => `这次识别结果里还有 ${issueSummary}。请重点看下面几项，暂不提交时可以点“草稿”保存。`,
+  ({ issueSummary }) => `我还需要你确认 ${issueSummary}。下面列出了具体内容；如果现在不方便补齐，可以先点“草稿”。`,
+  ({ issueSummary }) => `当前还有 ${issueSummary}，需要进一步处理。请根据下面提示核查，待补充完再继续；临时保存可点击“草稿”。`,
+  ({ issueSummary }) => `本次报销还有 ${issueSummary}，请先检查下面的补充项；想先留存当前识别结果时可以点“草稿”。`
+]
+
+function buildStableTemplateIndex(signature, total) {
+  const source = String(signature || '')
+  let hash = 0
+  for (let index = 0; index < source.length; index += 1) {
+    hash = ((hash << 5) - hash + source.charCodeAt(index)) >>> 0
+  }
+  return total ? hash % total : 0
+}
+
+function buildReviewPendingSummary(pendingCount, riskCount, signature = '') {
+  const issueParts = []
+  if (pendingCount) {
+    issueParts.push(`${pendingCount} 项信息待补充`)
+  }
+  if (riskCount) {
+    issueParts.push(`${riskCount} 条风险提醒`)
+  }
+  const issueSummary = issueParts.length ? issueParts.join('、') : '一些细节还需要进一步确认'
+  const templateIndex = buildStableTemplateIndex(signature || issueSummary, REVIEW_PENDING_SUMMARY_TEMPLATES.length)
+  return REVIEW_PENDING_SUMMARY_TEMPLATES[templateIndex]({ issueSummary })
+}
+
 export function buildReviewPlainFollowupCopy(reviewPayload) {
   const todoItems = buildReviewTodoItems(reviewPayload)
   const pendingCount = countReviewPendingItems(reviewPayload)
   const riskBriefs = resolvePresentationRiskBriefs(reviewPayload)
+  const extraMissingCount = resolveReviewExtraMissingLabels(reviewPayload).length
 
-  if (pendingCount || resolveReviewExtraMissingLabels(reviewPayload).length) {
+  if (pendingCount || extraMissingCount) {
+    const summarySignature = [
+      pendingCount || extraMissingCount,
+      riskBriefs.length,
+      ...todoItems.map((item) => `${item.key}:${item.title}:${item.status}`)
+    ].join('|')
     return {
-      lead: '我还需要你核查或补充下面这些信息：',
+      lead: '补充信息：',
+      tone: 'danger',
+      summary: buildReviewPendingSummary(pendingCount || extraMissingCount, riskBriefs.length, summarySignature),
       items: todoItems.map((item) => buildReviewPlainFollowupItem(item, true)),
-      notes: riskBriefs.length
-        ? [`另外还有 ${riskBriefs.length} 条风险提醒，提交前建议一起确认。`]
-        : []
+      notes: []
     }
   }
 
   return {
     lead: todoItems.length ? '我已整理出当前识别到的关键信息：' : '当前关键信息已基本整理完成。',
+    tone: 'neutral',
+    summary: '',
     items: todoItems.map((item) => buildReviewPlainFollowupItem(item, false)),
     notes: [
       reviewPayload?.can_proceed ? '确认无误后，可以继续下一步。' : '',