feat: add comprehensive management scripts for CodiMD

Add 9 management scripts to simplify CodiMD operations:
- start.sh: Start services with automatic .env setup
- stop.sh: Stop all services gracefully
- restart.sh: Restart all services
- logs.sh: View real-time logs for any service
- status.sh: Check service status and resource usage
- backup.sh: Backup database, uploads, and environment
- restore.sh: Restore from backups with interactive selection
- update.sh: Update Docker images with automatic backup
- cleanup.sh: Clean unused Docker resources

Add SCRIPTS.md with comprehensive usage documentation and examples.

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

logs.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+# CodiMD 日誌查看腳本
+
+SERVICE=${1:-codimd}
+
+echo "📋 顯示 $SERVICE 服務日誌（按 Ctrl+C 離開）..."
+echo ""
+
+docker-compose logs -f "$SERVICE"