feat(web): AI 意图规划置信度阈值与动作策略细化

- workbenchAiIntentPlannerModel 新增 WORKBENCH_AI_INTENT_CONFIDENCE_THRESHOLD 与 isLowConfidenceTravelApplicationPlan，shouldRequestWorkbenchAiIntentPlan 增加业务关键词前置过滤
- resolveExecutableTravelApplicationPlan 区分 requestedSubmit 与提交确认（submitRequiresConfirmation），autoSubmit 不再直接置真
- workbenchIntentActionPolicy 改用 policyDecision 路由（need_confirmation/query_candidates），透传 riskLevel/requiresSelection/requiresConfirmation
- workbenchIntentFrameModel 补充 query 动作识别，usePersonalWorkbenchAiMode/useWorkbenchAiActionRouter/useWorkbenchAiApplicationPreviewFlow 接入低置信度与确认流程
- 更新 intent-planner-model/intent-frame-model/application-gate-model/fast-preview 测试

web/src/composables/workbenchAiMode/useWorkbenchAiActionRouter.js

@@ -80,6 +80,19 @@ export function useWorkbenchAiActionRouter({
       })
       return
     }
+    if (actionType === 'ai_application_confirm_intent') {
+      aiExpenseDraft.value = null
+      void applicationFlow.startAiApplicationPreview('travel', '差旅费', String(actionPayload.sourceText || '').trim(), {
+        userMessage: String(actionPayload.sourceText || '').trim() || '确认发起出差申请',
+        pushUserMessage: true,
+        ontologyFields: actionPayload.ontologyFields || {},
+        autoSubmit: Boolean(actionPayload.autoSubmit),
+        autoSaveDraft: Boolean(actionPayload.autoSaveDraft),
+        requestedSubmit: Boolean(actionPayload.requestedSubmit),
+        submitRequiresConfirmation: Boolean(actionPayload.submitRequiresConfirmation)
+      })
+      return
+    }
     if (actionType === 'open_application_detail') {
       const claimNo = String(actionPayload.claim_no || actionPayload.claimNo || '').trim()
       const claimId = String(actionPayload.claim_id || actionPayload.claimId || '').trim()