fix(service): 修复 themeStyle=9999 时查询逻辑缺失

src/main/java/com/yolo/keyborad/model/vo/themes/KeyboardThemesRespVO.java

@@ -59,4 +59,10 @@ public class KeyboardThemesRespVO {
      */
     @Schema(description = "主题购买次数")
     private Long themePurchasesNumber;
+
+    @Schema(description = "排序")
+    private Integer sort;
+
+    @Schema(description = "是否免费")
+    private Boolean isFree;
 }