Fix MAX_CONTENT_LENGTH configuration for large file uploads

- Explicitly set MAX_CONTENT_LENGTH in Flask app config during initialization
- Add logging to verify MAX_CONTENT_LENGTH is set correctly
- Fixes 'File too large' error for files over 500MB (now supports 5GB)

config.py

@@ -265,6 +265,10 @@ class Config:
                 os.makedirs(Config.TEMP_UPLOAD_FOLDER, exist_ok=True)
                 logger.warning("Persistent directory utilities not available - using fallback directory creation")
 
+            # Set MAX_CONTENT_LENGTH explicitly in app config
+            app.config['MAX_CONTENT_LENGTH'] = Config.MAX_CONTENT_LENGTH
+            logger.info(f"Set MAX_CONTENT_LENGTH to {Config.MAX_CONTENT_LENGTH} bytes ({Config.MAX_CONTENT_LENGTH // (1024*1024)} MB)")
+
             # Create other necessary directories
             os.makedirs(os.path.dirname(Config.DAEMON_PID_FILE), exist_ok=True)
             os.makedirs(os.path.dirname(Config.DAEMON_LOG_FILE), exist_ok=True)
@@ -325,6 +329,7 @@ class ProductionConfig(Config):
                 logger.info(f"Using persistent directories - PyInstaller: {is_pyinstaller()}")
                 logger.info(f"Upload folder: {app.config.get('UPLOAD_FOLDER', cls.UPLOAD_FOLDER)}")
                 logger.info(f"Log file: {log_file}")
+                logger.info(f"MAX_CONTENT_LENGTH: {app.config.get('MAX_CONTENT_LENGTH', 'not set')}")
 
 class TestingConfig(Config):
     """Testing configuration"""