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

backend/internal/handler/instance_detail.go

@@ -10,7 +10,6 @@ import (
 	"github.com/gin-gonic/gin"
 	"time"
 	"context"
-	"github.com/redis/go-redis/v9"
 	"sql-platform/internal/middleware"
 	"strings"
 	"strconv"
@@ -665,14 +664,6 @@ func executeSQLQuery(instance *model.Instance, dbName string, sqlStr string, lim
 }
 
 func executeRedisQuery(instance *model.Instance, dbSelect string, command string, limit int, offset int) (gin.H, error) {
-	password := instance.Password
-	if strings.HasPrefix(password, "enc:") {
-		decrypted, err := decryptPassword(strings.TrimPrefix(password, "enc:"))
-		if err == nil {
-			password = decrypted
-		}
-	}
-
 	// Parse Redis DB number from dbSelect (e.g. "0", "1")
 	redisDB := 0
 	if dbSelect != "" {
@@ -681,17 +672,13 @@ func executeRedisQuery(instance *model.Instance, dbSelect string, command string
 		}
 	}
 
-	client := redis.NewClient(&redis.Options{
-		Addr:     fmt.Sprintf("%s:%d", instance.Host, instance.Port),
-		Password: password,
-		DB:       redisDB,
-	})
+	client, err := getRedisClient(instance, redisDB)
+	if err != nil {
+		return nil, err
+	}
 	defer client.Close()
 
 	ctx := context.Background()
-	if err := client.Ping(ctx).Err(); err != nil {
-		return nil, fmt.Errorf("Redis connection failed: %v", err)
-	}
 
 	parts := strings.Fields(command)
 	if len(parts) == 0 {