fix(frontend): 优化 API Provider 添加功能并处理异常

- 为 model_id、base_url 和 api_key 添加空值检查，避免无效输入
- 添加异常处理，确保在出现错误时能够及时响应并提示用户
- 优化 add_provider 函数，提高代码可读性和健壮性

frontend/setting_page.py

@@ -18,22 +18,27 @@ def setting_page():
             ]
 
     def add_provider(model_id, base_url, api_key):
-        with Session(engine) as session:
-            new_provider = APIProvider(
-                model_id=model_id,
-                base_url=base_url,
-                api_key=api_key if api_key else None
-            )
-            session.add(new_provider)
-            session.commit()
-            session.refresh(new_provider)
-        return get_providers()
+        try:
+            with Session(engine) as session:
+                new_provider = APIProvider(
+                    model_id=model_id if model_id else None,
+                    base_url=base_url if base_url else None,
+                    api_key=api_key if api_key else None
+                )
+                session.add(new_provider)
+                session.commit()
+                session.refresh(new_provider)
+                return get_providers()
+        except Exception as e:
+            # 抛出错误提示
+            raise gr.Error(f"添加失败: {str(e)}")
 
     with gr.Blocks() as demo:
         gr.Markdown("## API Provider 管理")
         
         with gr.Row():
             with gr.Column(scale=1):
+                
                 model_id_input = gr.Textbox(label="Model ID")
                 base_url_input = gr.Textbox(label="Base URL")
                 api_key_input = gr.Textbox(label="API Key")
@@ -57,7 +62,7 @@ def setting_page():
         add_button.click(
             fn=add_provider,
             inputs=[model_id_input, base_url_input, api_key_input],
-            outputs=provider_table
+            outputs=[provider_table]
         )
 
     return demo