feat(web): 报销单新增关联申请单门控与草稿检测流程

- 新增 travelReimbursementAssociationGateModel，查询可关联申请单/草稿报销单并生成跳过/选择/单独新建动作，区分差旅费与业务招待费类型
- travelReimbursementApplicationLinkModel 补充 buildLinkedApplicationReferenceIndex/buildRequiredApplicationActions 等关联构建逻辑
- useTravelReimbursementSuggestedActions 接入 select_required_application/skip 系列动作，'我要报销'入口改为先走关联门控
- useWorkbenchAiActionRouter 新增 SKIP_REQUIRED_APPLICATION_LINK/SKIP_REIMBURSEMENT_DRAFT_CHECK 动作分发
- useWorkbenchAiExpenseFlow 暴露 startAiReimbursementAssociationGate，stewardPlanModel 待处理流程适配
- 新增 workbench-ai-action-router、workbench-ai-reimbursement-association-gate 测试并更新 guided-flow、steward-plan 测试

web/src/views/scripts/stewardPlanModel.js

@@ -258,6 +258,51 @@ function resolveCandidateFlowExpenseType(flow = {}) {
   return rawType
 }
 
+function normalizeStewardExpenseTypeCode(value = '') {
+  const text = String(value || '').trim()
+  if (text === '差旅' || text === '差旅费' || text === 'travel') {
+    return 'travel'
+  }
+  return text
+}
+
+function resolveTaskExpenseType(task = null) {
+  const fields = task?.ontologyFields || task?.ontology_fields || {}
+  const explicitType = normalizeStewardExpenseTypeCode(
+    fields.expense_type ||
+      fields.expenseType ||
+      fields.application_type ||
+      fields.applicationType ||
+      ''
+  )
+  if (explicitType) {
+    return explicitType
+  }
+  const taskText = [
+    task?.title,
+    task?.summary,
+    fields.reason,
+    fields.location
+  ].map((item) => String(item || '').trim()).join(' ')
+  return /差旅|出差/.test(taskText) ? 'travel' : ''
+}
+
+function buildStewardApplicationPreviewRoutePayload(actionType, task = null) {
+  if (actionType !== 'confirm_create_application') {
+    return {}
+  }
+  const expenseType = resolveTaskExpenseType(task)
+  if (expenseType !== 'travel') {
+    return {}
+  }
+  return {
+    steward_confirm_flow: true,
+    flow_id: 'travel_application',
+    expense_type: expenseType,
+    expense_type_label: FLOW_EXPENSE_TYPE_LABELS[expenseType] || ''
+  }
+}
+
 export function buildStewardSuggestedActions(plan) {
   const normalized = normalizeStewardPlan(plan)
   if (isOffTopicPlan(normalized)) {
@@ -320,6 +365,7 @@ export function buildStewardSuggestedActions(plan) {
       action_type: ASSISTANT_SCOPE_ACTION_SWITCH,
       payload: {
         session_type: targetSessionType,
+        ...buildStewardApplicationPreviewRoutePayload(actionType, task),
         carry_text: buildStewardCarryText(actionType, task, group, normalized),
         carry_files: actionType !== 'confirm_create_application',
         auto_submit: true,