fix: request no reasoning for liveness and handle empty text

app/main.py

@@ -638,6 +638,7 @@ def api_check(model_id: str):
             "model": model_id,
             "messages": [{"role": "user", "content": "What is 2+2? Reply with just the number."}],
             "max_tokens": 5,
+            "reasoning_effort": "none",
         }).encode()
         req = urllib.request.Request(
             f"{OMNIROUTE_URL}/v1/chat/completions",
@@ -652,8 +653,11 @@ def api_check(model_id: str):
             # Usage фиксируем ДО валидации контента: даже если парсинг choices
             # упадёт, реально потраченные токены сохраняются в checks.
             usage = extract_usage(resp)
-            content = resp["choices"][0]["message"]["content"]
-            ok = bool(content.strip())
+            choice = resp["choices"][0]
+            content = choice["message"].get("content")
+            ok = isinstance(content, str) and bool(content.strip())
+            if not ok:
+                error = f"Empty text response (finish_reason={choice.get('finish_reason')})"
     except Exception as e:
         error = f"{type(e).__name__}: {e}"
         print(f"[check] {model_id}: {error}")