fix: nonlocal → global для _ping_llm_cache

api/routes.py

@@ -196,7 +196,7 @@ def register(app):
     @app.route("/api/v1/ping-llm", methods=["GET"])
     def ping_llm():
         """Быстрая проверка доступности LLM (с кэшем 60с)."""
-        nonlocal _ping_llm_cache
+        global _ping_llm_cache
         now = time.time()
         if _ping_llm_cache and (now - _ping_llm_cache.get("ts", 0)) < 60:
             return jsonify(_ping_llm_cache["data"])