feat: 端点 API 支持 custom_path 字段

- ProviderEndpointCreate 添加 custom_path 参数
- ProviderEndpointUpdate 添加 custom_path 参数
- ProviderEndpointResponse 返回 custom_path 字段
- 创建端点时传递 custom_path 到数据库模型

src/api/admin/endpoints/routes.py

@@ -206,6 +206,7 @@ class AdminCreateProviderEndpointAdapter(AdminApiAdapter):
             provider_id=self.provider_id,
             api_format=self.endpoint_data.api_format,
             base_url=self.endpoint_data.base_url,
+            custom_path=self.endpoint_data.custom_path,
             headers=self.endpoint_data.headers,
             timeout=self.endpoint_data.timeout,
             max_retries=self.endpoint_data.max_retries,

src/models/endpoint_models.py

@@ -19,6 +19,7 @@ class ProviderEndpointCreate(BaseModel):
     provider_id: str = Field(..., description="Provider ID")
     api_format: str = Field(..., description="API 格式 (CLAUDE, OPENAI, CLAUDE_CLI, OPENAI_CLI)")
     base_url: str = Field(..., min_length=1, max_length=500, description="API 基础 URL")
+    custom_path: Optional[str] = Field(default=None, max_length=200, description="自定义请求路径")
 
     # 请求配置
     headers: Optional[Dict[str, str]] = Field(default=None, description="自定义请求头")
@@ -62,6 +63,7 @@ class ProviderEndpointUpdate(BaseModel):
     base_url: Optional[str] = Field(
         default=None, min_length=1, max_length=500, description="API 基础 URL"
     )
+    custom_path: Optional[str] = Field(default=None, max_length=200, description="自定义请求路径")
     headers: Optional[Dict[str, str]] = Field(default=None, description="自定义请求头")
     timeout: Optional[int] = Field(default=None, ge=10, le=600, description="超时时间（秒）")
     max_retries: Optional[int] = Field(default=None, ge=0, le=10, description="最大重试次数")
@@ -94,6 +96,7 @@ class ProviderEndpointResponse(BaseModel):
     # API 配置
     api_format: str
     base_url: str
+    custom_path: Optional[str] = None
 
     # 请求配置
     headers: Optional[Dict[str, str]] = None