Merge pull request 'Parse GitHub Models catalog response defensively' (#4) from fix/github-catalog-parsing into main

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

artifacts/flask-api/ai_agent.py

@@ -84,7 +84,12 @@ def list_model_ids() -> list[str]:
     """Modèles accessibles avec la clé en place (GitHub Models : catalogue dédié, /models n'est pas OpenAI-compatible)."""
     client = get_client()
     if "models.github.ai" in str(client.base_url):
-        return sorted(m["id"] for m in client.get(GITHUB_CATALOG_URL, cast_to=object))
+        raw = client.get(GITHUB_CATALOG_URL, cast_to=object)
+        if isinstance(raw, (str, bytes)):  # content-type non-JSON : le SDK rend le texte brut
+            raw = json.loads(raw)
+        if isinstance(raw, dict):
+            raw = next((v for v in raw.values() if isinstance(v, list)), [])
+        return sorted(m["id"] if isinstance(m, dict) else str(m) for m in raw)
     return sorted(m.id for m in client.models.list().data)