feat: Redis cluster support + version auto-detect + metrics API

backend/internal/model/model.go

@@ -42,6 +42,7 @@ type Instance struct {
 	Description        *string    `gorm:"type:text" json:"description"`
 	Status             *string    `gorm:"size:20" json:"status"`
 	Version            *string    `gorm:"size:50" json:"version"`
+	ClusterMode        *bool      `gorm:"default:false" json:"cluster_mode"`
 	CreatedAt          time.Time  `gorm:"default:CURRENT_TIMESTAMP" json:"created_at"`
 	UpdatedAt          time.Time  `gorm:"default:CURRENT_TIMESTAMP" json:"updated_at"`
 	AccessMode         *string    `gorm:"size:20;default:readwrite" json:"access_mode"`