feat: default pinned models

Co-Authored-By: Classic298 <27028174+Classic298@users.noreply.github.com>

backend/open_webui/routers/configs.py

@@ -463,6 +463,7 @@ async def set_code_execution_config(
 ############################
 class ModelsConfigForm(BaseModel):
     DEFAULT_MODELS: Optional[str]
+    DEFAULT_PINNED_MODELS: Optional[str]
     MODEL_ORDER_LIST: Optional[list[str]]
 
 
@@ -470,6 +471,7 @@ class ModelsConfigForm(BaseModel):
 async def get_models_config(request: Request, user=Depends(get_admin_user)):
     return {
         "DEFAULT_MODELS": request.app.state.config.DEFAULT_MODELS,
+        "DEFAULT_PINNED_MODELS": request.app.state.config.DEFAULT_PINNED_MODELS,
         "MODEL_ORDER_LIST": request.app.state.config.MODEL_ORDER_LIST,
     }
 
@@ -479,9 +481,11 @@ async def set_models_config(
     request: Request, form_data: ModelsConfigForm, user=Depends(get_admin_user)
 ):
     request.app.state.config.DEFAULT_MODELS = form_data.DEFAULT_MODELS
+    request.app.state.config.DEFAULT_PINNED_MODELS = form_data.DEFAULT_PINNED_MODELS
     request.app.state.config.MODEL_ORDER_LIST = form_data.MODEL_ORDER_LIST
     return {
         "DEFAULT_MODELS": request.app.state.config.DEFAULT_MODELS,
+        "DEFAULT_PINNED_MODELS": request.app.state.config.DEFAULT_PINNED_MODELS,
         "MODEL_ORDER_LIST": request.app.state.config.MODEL_ORDER_LIST,
     }