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>

update.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# CodiMD 更新腳本
+
+set -e
+
+echo "🔄 更新 CodiMD..."
+echo ""
+
+# 1. 備份現有資料
+echo "💾 更新前備份..."
+./backup.sh
+echo ""
+
+# 2. 拉取最新映像
+echo "📥 拉取最新 Docker 映像..."
+docker-compose pull
+echo ""
+
+# 3. 詢問是否重啟
+read -p "是否現在重啟服務以套用更新？(yes/no): " RESTART
+
+if [ "$RESTART" = "yes" ]; then
+    echo "🔄 重啟服務..."
+    docker-compose down
+    docker-compose up -d
+
+    echo ""
+    echo "⏳ 等待服務啟動..."
+    sleep 10
+
+    echo ""
+    echo "📊 服務狀態："
+    docker-compose ps
+
+    echo ""
+    echo "✅ 更新完成！"
+    echo ""
+    echo "📝 查看日誌: ./logs.sh"
+else
+    echo ""
+    echo "⚠️  映像已下載，但服務尚未重啟"
+    echo "💡 稍後可執行 ./restart.sh 來套用更新"
+fi