enh: reintroduce model order/default models

backend/open_webui/main.py

@@ -1194,6 +1194,14 @@ async def get_models(user=Depends(get_verified_user)):
         if "pipeline" not in model or model["pipeline"].get("type", None) != "filter"
     ]
 
+    model_order_list = webui_app.state.config.MODEL_ORDER_LIST
+    if model_order_list:
+        model_order_dict = {model_id: i for i, model_id in enumerate(model_order_list)}
+        # Sort models by order list priority, with fallback for those not in the list
+        models.sort(
+            key=lambda x: (model_order_dict.get(x["id"], float("inf")), x["name"])
+        )
+
     # Filter out models that the user does not have access to
     if user.role == "user":
         filtered_models = []