refactor(service): 移除 themeStatus 字段并新增 themeDownloadUrl

- 删除 VO 中的 themeStatus 属性
- 新增 themeDownloadUrl 用于前端下载
- 简化购买记录字段赋值顺序

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

@@ -52,11 +52,9 @@ public class KeyboardThemesRespVO {
 
     @Schema(description = "预览图")
     private String themePreviewImageUrl;
-    /**
-     * 主题状态
-     */
-    @Schema(description = "主题状态")
-    private Boolean themeStatus;
+
+    @Schema(description = "下载地址")
+    private String themeDownloadUrl;
 
     /**
      * 主题购买次数

src/main/java/com/yolo/keyborad/service/impl/KeyboardThemePurchaseServiceImpl.java

@@ -236,7 +236,6 @@ public class KeyboardThemePurchaseServiceImpl extends ServiceImpl<KeyboardThemeP
                     vo.setThemeTag(theme.getThemeTag());  // 主题标签
                     vo.setThemeDownload(theme.getThemeDownload());  // 下载地址
                     vo.setThemeStyle(theme.getThemeStyle());  // 主题风格
-                    vo.setThemeStatus(theme.getThemeStatus());  // 主题状态
                     vo.setThemePurchasesNumber(theme.getThemePurchasesNumber());  // 购买次数
                     vo.setSort(theme.getSort());  // 排序值
                     vo.setIsFree(theme.getIsFree());  // 是否免费