refactor(agent): refactor Agent model parameters reset logic and add environment variable support

Split reset_agent_config into two independent methods for getting and resetting model parameters
Add functionality to read quota configuration from environment variables to the default free tier

api/app/controllers/app_controller.py

@@ -271,18 +271,17 @@ def update_agent_config(
     return success(data=app_schema.AgentConfig.model_validate(cfg))
 
 
-@router.post("/{app_id}/config/reset", summary="重置 Agent 配置为默认状态")
+@router.post("/{app_id}/model/parameters/reset", summary="获取 Agent 模型参数默认配置")
 @cur_workspace_access_guard()
-def reset_agent_config(
+def reset_agent_model_parameters(
         app_id: uuid.UUID,
         db: Session = Depends(get_db),
         current_user=Depends(get_current_user),
 ):
     workspace_id = current_user.current_workspace_id
     service = AppService(db)
-    cfg = service.reset_agent_config(app_id=app_id, workspace_id=workspace_id)
-    cfg = enrich_agent_config(cfg)
-    return success(data=app_schema.AgentConfig.model_validate(cfg), msg="Agent 配置已重置为默认状态")
+    model_parameters = service.get_default_model_parameters(app_id=app_id)
+    return success(data=model_parameters, msg="获取 Agent 模型参数默认配置")
 
 
 @router.get("/{app_id}/config", summary="获取 Agent 配置")