Reload Ollama models on URL change, pre-select current model

- /api/ollama-models accepts optional url query param to query a different endpoint
- Frontend fetches models on load and on Ollama URL blur
- Keeps current model selected if available, otherwise selects first in list
- Shows loading indicator while fetching

backend/admin.py

@@ -112,8 +112,12 @@ async def update_settings(
     return settings
 
 @app.get("/api/ollama-models")
-async def get_ollama_models(db: Session = Depends(get_db), _ = Depends(require_admin_auth)):
-    ollama_url = crud.get_setting(db, "ollama_url", "http://localhost:11434")
+async def get_ollama_models(
+    url: str = None,
+    db: Session = Depends(get_db),
+    _ = Depends(require_admin_auth),
+):
+    ollama_url = url or crud.get_setting(db, "ollama_url", "http://localhost:11434")
     try:
         async with httpx.AsyncClient(timeout=5.0) as client:
             response = await client.get(f"{ollama_url}/api/tags")