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>

cleanup.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# CodiMD 清理腳本
+
+set -e
+
+echo "🧹 清理 Docker 資源..."
+echo ""
+
+# 1. 清理未使用的映像
+echo "🗑️  清理未使用的 Docker 映像..."
+docker image prune -f
+
+# 2. 清理未使用的容器
+echo "🗑️  清理停止的容器..."
+docker container prune -f
+
+# 3. 清理未使用的網路
+echo "🗑️  清理未使用的網路..."
+docker network prune -f
+
+# 4. 清理建置快取
+echo "🗑️  清理建置快取..."
+docker builder prune -f
+
+echo ""
+echo "✅ 清理完成！"
+echo ""
+
+# 顯示釋放的空間
+echo "💾 目前 Docker 磁碟使用："
+docker system df