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>

backup.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+# CodiMD 備份腳本
+
+set -e
+
+# 備份目錄
+BACKUP_DIR="./backups"
+TIMESTAMP=$(date +"%Y%m%d_%H%M%S")
+
+# 建立備份目錄
+mkdir -p "$BACKUP_DIR"
+
+echo "💾 開始備份 CodiMD..."
+echo "📅 備份時間: $(date)"
+echo ""
+
+# 1. 備份資料庫
+echo "📦 備份 PostgreSQL 資料庫..."
+docker-compose exec -T database pg_dump -U codimd codimd > "$BACKUP_DIR/database_$TIMESTAMP.sql"
+
+if [ $? -eq 0 ]; then
+    DB_SIZE=$(du -h "$BACKUP_DIR/database_$TIMESTAMP.sql" | cut -f1)
+    echo "✅ 資料庫備份完成 ($DB_SIZE)"
+else
+    echo "❌ 資料庫備份失敗"
+    exit 1
+fi
+
+# 2. 備份上傳檔案
+echo "📁 備份上傳檔案..."
+UPLOAD_BACKUP="$BACKUP_DIR/uploads_$TIMESTAMP.tar.gz"
+
+if [ -d "upload-data" ] && [ "$(ls -A upload-data)" ]; then
+    tar -czf "$UPLOAD_BACKUP" upload-data/
+    UPLOAD_SIZE=$(du -h "$UPLOAD_BACKUP" | cut -f1)
+    echo "✅ 上傳檔案備份完成 ($UPLOAD_SIZE)"
+else
+    echo "⚠️  沒有上傳檔案需要備份"
+fi
+
+# 3. 備份環境設定
+echo "📝 備份環境設定..."
+cp .env "$BACKUP_DIR/env_$TIMESTAMP.env"
+echo "✅ 環境設定備份完成"
+
+# 4. 建立備份資訊文件
+cat > "$BACKUP_DIR/backup_$TIMESTAMP.txt" << EOF
+CodiMD 備份資訊
+================
+備份時間: $(date)
+備份類型: 完整備份
+
+檔案清單:
+- 資料庫: database_$TIMESTAMP.sql
+- 上傳檔案: uploads_$TIMESTAMP.tar.gz
+- 環境設定: env_$TIMESTAMP.env
+
+還原方式:
+1. 資料庫: cat database_$TIMESTAMP.sql | docker-compose exec -T database psql -U codimd codimd
+2. 上傳檔案: tar -xzf uploads_$TIMESTAMP.tar.gz
+3. 環境設定: cp env_$TIMESTAMP.env .env
+EOF
+
+echo ""
+echo "✅ 備份完成！"
+echo ""
+echo "📂 備份位置: $BACKUP_DIR/"
+ls -lh "$BACKUP_DIR" | grep "$TIMESTAMP"
+echo ""
+echo "💡 還原備份請查看: $BACKUP_DIR/backup_$TIMESTAMP.txt"
+
+# 清理超過 30 天的舊備份
+echo ""
+echo "🧹 清理舊備份（超過 30 天）..."
+find "$BACKUP_DIR" -name "database_*.sql" -mtime +30 -delete 2>/dev/null || true
+find "$BACKUP_DIR" -name "uploads_*.tar.gz" -mtime +30 -delete 2>/dev/null || true
+find "$BACKUP_DIR" -name "env_*.env" -mtime +30 -delete 2>/dev/null || true
+echo "✅ 清理完成"