chore(docker): set PYTHONUNBUFFERED=1 for immediate log flushing

Dockerfile

@@ -11,7 +11,8 @@ ENV PIP_NO_CACHE_DIR=1 \
 	HF_CACHE_DIR=/data/hf-cache \
 	HUGGINGFACE_HUB_CACHE=/data/hf-cache \
 	MPLCONFIGDIR=/data/matplotlib \
-	PYTHONPATH=/app:/app/custom_models:$PYTHONPATH
+	PYTHONPATH=/app:/app/custom_models:$PYTHONPATH \
+	PYTHONUNBUFFERED=1
 
 RUN mkdir -p /data/hf /data/hf-cache /data/matplotlib && chmod -R 777 /data