fix(workflow): fix improper merge of execution flows caused by multi-branch routing

api/app/controllers/app_controller.py

@@ -7,7 +7,7 @@ from sqlalchemy.orm import Session
 
 from app.core.error_codes import BizCode
 from app.core.logging_config import get_business_logger
-from app.core.response_utils import success
+from app.core.response_utils import success, fail
 from app.db import get_db
 from app.dependencies import get_current_user, cur_workspace_access_guard
 from app.models import User
@@ -661,6 +661,11 @@ async def draft_run(
             data=result,
             msg="工作流任务执行成功"
         )
+    else:
+        return fail(
+            msg="未知应用类型",
+            code=422
+        )
 
 
 @router.post("/{app_id}/draft/run/compare", summary="多模型对比试运行")