feat: update the redis reference to cache.Cmdable instead (#535)

backend/infra/impl/checkpoint/redis.go

@@ -24,10 +24,12 @@ import (
 
 	"github.com/cloudwego/eino/compose"
 	"github.com/redis/go-redis/v9"
+
+	"github.com/coze-dev/coze-studio/backend/infra/contract/cache"
 )
 
 type redisStore struct {
-	client *redis.Client
+	client cache.Cmdable
 }
 
 const (
@@ -38,7 +40,7 @@ const (
 func (r *redisStore) Get(ctx context.Context, checkPointID string) ([]byte, bool, error) {
 	v, err := r.client.Get(ctx, fmt.Sprintf(checkpointKeyTpl, checkPointID)).Bytes()
 	if err != nil {
-		if errors.Is(err, redis.Nil) {
+		if errors.Is(err, cache.Nil) {
 			return nil, false, nil
 		}
 		return nil, false, err