Fix xterm package versions and make models endpoint resilient

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/main.py

@@ -399,9 +399,10 @@ async def list_models():
         async with httpx.AsyncClient(timeout=10) as client:
             resp = await client.get(f"{OLLAMA_URL}/api/tags")
             resp.raise_for_status()
-            return {"models": resp.json().get("models", [])}
+            return {"models": resp.json().get("models", []), "error": None}
     except Exception as exc:
-        raise HTTPException(status_code=500, detail=str(exc))
+        # Return empty list instead of crashing — Ollama may not be reachable yet
+        return {"models": [], "error": str(exc)}
 
 
 @app.websocket("/api/models/pull")
@@ -447,4 +448,4 @@ async def delete_model(model_name: str):
 
 if __name__ == "__main__":
     import uvicorn
-    uvicorn.run(app, host="0.0.0.0", port=8080, reload=True)
+    uvicorn.run("main:app", host="0.0.0.0", port=8080, reload=True)