fix(db): silence GORM record-not-found spam in debug mode

getSetting handles ErrRecordNotFound via database.IsNotFound and falls
back to defaults, but GORM's Default logger still logs each miss as an
error. With periodic jobs reading unset keys (xrayTemplateConfig,
externalTrafficInformEnable) the panel log flooded thousands of times.
Switch to a logger.New with IgnoreRecordNotFoundError=true so legitimate
slow-query and SQL traces still surface in debug mode.

database/db.go

@@ -346,7 +346,15 @@ func isTableEmpty(tableName string) (bool, error) {
 func InitDB(dbPath string) error {
 	var gormLogger logger.Interface
 	if config.IsDebug() {
-		gormLogger = logger.Default
+		gormLogger = logger.New(
+			log.New(os.Stdout, "\r\n", log.LstdFlags),
+			logger.Config{
+				SlowThreshold:             time.Second,
+				LogLevel:                  logger.Info,
+				IgnoreRecordNotFoundError: true,
+				Colorful:                  true,
+			},
+		)
 	} else {
 		gormLogger = logger.Discard
 	}