feat: Add multi-threaded file transfers and enhanced logging support

- Implement concurrent file transfer processing with configurable concurrency
- Add new `max_concurrent_transfers` column to transfer configurations
- Enhance scheduler to support multi-threaded file transfers
- Introduce advanced logging system with rotation and configurable log levels
- Update Docker Compose and documentation with new logging configuration options
- Modify directory structure to separate data, backups, and logs
- Add environment variables for comprehensive logging control
- Improve error handling and logging in file transfer processes

docker-compose.yaml

@@ -8,14 +8,17 @@ services:
     ports:
       - "8080:8080"
     volumes:
-      # Persist data directory for SQLite database and configurations
+      # Main data directory - contains DB and configs
       - gomft-data:/app/data
+      # Separate backups directory
+      - gomft-backups:/app/backups
       # For development, you can mount the source code
       # - .:/app
     environment:
       - TZ=UTC
-      # Add any environment variables needed for configuration
-      # - GOMFT_DB_PATH=/app/data/gomft.db
+      - DATA_DIR=/app/data
+      - BACKUP_DIR=/app/backups
+      - GOMFT_LOGS_DIR=/app/data/logs
       # - GOMFT_LOG_LEVEL=info
     networks:
       - gomft-network
@@ -26,4 +29,6 @@ networks:
 
 volumes:
   gomft-data:
+    driver: local
+  gomft-backups:
     driver: local