Enhance docker logging for debugging (Python unbuffered, GORM logger, yt-dlp debug wrapper)

Dockerfile

@@ -11,6 +11,9 @@ RUN cd backend && CGO_ENABLED=1 go build -o /app/main main.go
 # 2. Final Minimal Image (Python + Go binary + Frontend)
 FROM python:3.10-slim
 
+# 파이썬 출력 버퍼링을 비활성화하여 도커 로그에 즉각 표시되도록 설정합니다.
+ENV PYTHONUNBUFFERED=1
+
 # Install system dependencies (ffmpeg is required for yt-dlp)
 RUN apt-get update && apt-get install -y \
     ffmpeg \