fix: add Docker Compose V2 support for all management scripts

Add docker-compose-helper.sh to auto-detect and use:
- docker-compose (V1 - standalone)
- docker compose (V2 - plugin)

Update all 9 management scripts to use the helper:
- start.sh, stop.sh, restart.sh
- logs.sh, status.sh
- backup.sh, restore.sh, update.sh, cleanup.sh

This fixes "docker-compose: command not found" error on systems
with Docker Compose V2 installed.

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

update.sh

@@ -3,6 +3,10 @@
 
 set -e
 
+# 載入 docker compose 輔助函數
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/docker-compose-helper.sh"
+
 echo "🔄 更新 CodiMD..."
 echo ""
 
@@ -13,7 +17,7 @@ echo ""
 
 # 2. 拉取最新映像
 echo "📥 拉取最新 Docker 映像..."
-docker-compose pull
+docker_compose pull
 echo ""
 
 # 3. 詢問是否重啟
@@ -21,8 +25,8 @@ 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
+    docker_compose down
+    docker_compose up -d
 
     echo ""
     echo "⏳ 等待服務啟動..."
@@ -30,7 +34,7 @@ if [ "$RESTART" = "yes" ]; then
 
     echo ""
     echo "📊 服務狀態："
-    docker-compose ps
+    docker_compose ps
 
     echo ""
     echo "✅ 更新完成！"