fix(expenses): unify AI application submission transaction

server/src/app/services/budget.py

@@ -15,8 +15,8 @@ from app.schemas.budget import (
     BudgetAllocationRead,
     BudgetCheckRead,
     BudgetCheckRequest,
-    BudgetOperationRequest,
     BudgetOperationRead,
+    BudgetOperationRequest,
     BudgetSummaryRead,
     BudgetTransactionRead,
 )
@@ -31,7 +31,8 @@ class BudgetService(BudgetPaginationMixin, BudgetSupportMixin):
         self.db = db
 
     def ensure_budget_ready(self) -> None:
-        Base.metadata.create_all(bind=self.db.get_bind())
+        # 复用当前 Session 连接，避免在业务事务中通过 Engine 隐式提交已 flush 的单据。
+        Base.metadata.create_all(bind=self.db.connection())
         exists = self.db.scalar(select(BudgetAllocation.id).limit(1))
         if exists:
             return

server/src/app/services/user_agent_application.py

@@ -781,26 +781,30 @@ class UserAgentApplicationPersistenceMixin:
             currency="CNY",
             invoice_count=0,
             occurred_at=self._parse_application_occurred_at(facts.get("time", "")),
-            submitted_at=datetime.now(UTC) if submit else None,
-            status="submitted" if submit else "draft",
-            approval_stage="直属领导审批" if submit else "待提交",
+            submitted_at=None,
+            status="draft",
+            approval_stage="待提交",
             risk_flags_json=[self._build_application_detail_flag(facts)],
         )
         self.db.add(claim)
         self.db.flush()
-        if submit:
-            from app.services.expense_claims import ExpenseClaimService
+        if not submit:
+            self.db.commit()
+            self.db.refresh(claim)
+            return claim
 
-            platform_review = ExpenseClaimService(self.db).evaluate_platform_risk_rules(
-                claim,
-                business_stage="expense_application",
-            )
-            platform_flags = list(platform_review.get("flags") or [])
-            if platform_flags:
-                claim.risk_flags_json = [*list(claim.risk_flags_json or []), *platform_flags]
-        self.db.commit()
-        self.db.refresh(claim)
-        return claim
+        from app.services.expense_claims import ExpenseClaimService
+
+        try:
+            submitted = ExpenseClaimService(self.db).submit_claim(claim.id, current_user)
+        except Exception:
+            # 外层编排会记录失败工具调用并提交事务，必须先回滚本次已 flush 的草稿。
+            self.db.rollback()
+            raise
+        if submitted is None:
+            self.db.rollback()
+            raise ValueError("未找到可提交的申请单。")
+        return submitted
 
     def _find_duplicate_expense_application_record(
         self,