initail commic

app.py

@@ -40,7 +40,7 @@ logger = logging.getLogger("kcrobot.v7.5")
 
 # ---------------- env / secrets ----------------
 HF_TOKEN = os.getenv("HF_TOKEN", "").strip()
-HF_MODEL = os.getenv("HF_MODEL", "").strip()           # preferred model (may be empty)
+HF_MODEL = os.getenv("HF_MODEL", "auto").strip()           # preferred model (may be empty)
 HF_TTS_MODEL = os.getenv("HF_TTS_MODEL", "").strip()   # optional HF TTS model
 HF_STT_MODEL = os.getenv("HF_STT_MODEL", "openai/whisper-small").strip()
 TELEGRAM_TOKEN = os.getenv("TELEGRAM_TOKEN", "").strip()