:feat 新增模型配置页面和相关功能

- 新增模型配置页面组件和路由
- 实现模型配置表单和相关逻辑- 添加全局配置入口和功能- 优化首页布局和样式- 新增 404 页面组件
- 更新部分组件样式和结构

backend/app/gpt/provider/OpenAI_compatible_provider.py

@@ -0,0 +1,22 @@
+from typing import Optional, Union
+
+from openai import OpenAI
+
+class OpenAICompatibleProvider:
+    def __init__(self, api_key: str, base_url: str, model: Union[str, None]=None):
+        self.client = OpenAI(api_key=api_key, base_url=base_url)
+        self.model = model
+
+    @property
+    def get_client(self):
+        return self.client
+
+    @staticmethod
+    def test_connection(api_key: str, base_url: str) -> bool:
+        try:
+            client = OpenAI(api_key=api_key, base_url=base_url)
+            client.models.list()
+            return True
+        except Exception as e:
+            print(f"Error connecting to OpenAI API: {e}")
+            return False