feat(workflow): add opening statement and citation support

- Trigger opening statement on new conversation in run/run_stream
- Fix /opening endpoint to support workflow app type
- Fix features field missing in workflow config release snapshot
- Knowledge node returns citations alongside chunks
- Aggregate citations from all knowledge nodes in result builder
- Filter citations based on features.citation.enabled switch
- Fix WorkflowConfigCreate circular import in app_schema

api/app/controllers/app_controller.py

@@ -292,10 +292,19 @@ def get_opening(
 ):
     """返回开场白文本和预设问题，供前端对话界面初始化时展示"""
     workspace_id = current_user.current_workspace_id
-    cfg = app_service.get_agent_config(db, app_id=app_id, workspace_id=workspace_id)
-    features = cfg.features or {}
-    if hasattr(features, "model_dump"):
-        features = features.model_dump()
+
+    # 根据应用类型获取 features
+    from app.models.app_model import App as AppModel
+    app = db.get(AppModel, app_id)
+    if app and app.type == "workflow":
+        cfg = app_service.get_workflow_config(db=db, app_id=app_id, workspace_id=workspace_id)
+        features = cfg.features or {}
+    else:
+        cfg = app_service.get_agent_config(db, app_id=app_id, workspace_id=workspace_id)
+        features = cfg.features or {}
+        if hasattr(features, "model_dump"):
+            features = features.model_dump()
+
     opening = features.get("opening_statement", {})
     return success(data=app_schema.OpeningResponse(
         enabled=opening.get("enabled", False),

api/app/controllers/document_controller.py

@@ -314,8 +314,10 @@ async def parse_documents(
         )
 
         # 4. Check if the file exists
+        api_logger.debug(f"Constructed file path: {file_path}")
+        api_logger.debug(f"File metadata - kb_id: {db_file.kb_id}, parent_id: {db_file.parent_id}, file_id: {db_file.id}, extension: {db_file.file_ext}")
         if not os.path.exists(file_path):
-            api_logger.warning(f"File not found (possibly deleted): file_path={file_path}")
+            api_logger.error(f"File not found (possibly deleted): file_path={file_path}, file_id={db_file.id}, document_id={document_id}")
             raise HTTPException(
                 status_code=status.HTTP_404_NOT_FOUND,
                 detail="File not found (possibly deleted)"