fix: add check for thumbnail generation configuration

cmd/server/main.go

@@ -2838,6 +2838,10 @@ func generateThumbnail(originalPath, size string) error {
 		return nil
 	}
 
+	if (!conf.Thumbnails.Enabled) {
+		return nil
+	}
+
 	// Check if the file is an image
 	if !isImageFile(originalPath) {
 		log.Infof("File %s is not an image. Skipping thumbnail generation.", originalPath)
@@ -3170,7 +3174,6 @@ func verifyAndRepairThumbnails(thumbnailPaths []string, redisClient *redis.Clien
 				log.Warnf("Error storing new hash for thumbnail %s in Redis: %v", thumbPath, err)
 				continue
 			}
-
 			log.Infof("Successfully regenerated and updated thumbnail %s", thumbPath)
 		}
 	}