Backend: Python-Logging statt print, Diagnose in allen Fallbacks

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/main.py

@@ -3,6 +3,10 @@ from contextlib import asynccontextmanager
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 
+from logsetup import setup_logging
+
+setup_logging()
+
 from config import FRONTEND_DIST, STORAGE_DIR
 from database import init_db, close_db
 from routes import router