新增首页 AW炫彩回收入口，支持后台配置展示图

首页第三入口点击查看回收说明图；配置项 mobile.aw_recycle 可配标题/图片；aw-recycle 走公开文件链路，首页鉴权预览兼容旧私有地址。

backend/internal/modules/systemconfig/service_home.go

@@ -28,6 +28,10 @@ func (s *Service) HomeConfig(ctx context.Context) (*HomeConfigDTO, error) {
 	if err != nil {
 		return nil, err
 	}
+	awRecycle, err := s.awRecycle(ctx)
+	if err != nil {
+		return nil, err
+	}
 	publishOptions, err := s.publishOptions(ctx)
 	if err != nil {
 		return nil, err
@@ -36,6 +40,7 @@ func (s *Service) HomeConfig(ctx context.Context) (*HomeConfigDTO, error) {
 		Announcements:  announcements,
 		Banners:        banners,
 		PublishOptions: publishOptions,
+		AWRecycle:      awRecycle,
 	}, nil
 }
 
@@ -62,3 +67,15 @@ func (s *Service) homeBanners(ctx context.Context) ([]HomeBannerItem, error) {
 	}
 	return normalizeHomeBanners(items), nil
 }
+
+func (s *Service) awRecycle(ctx context.Context) (AWRecycleConfig, error) {
+	value, err := s.repo.FindValue(ctx, awRecycleConfigKey)
+	if err != nil {
+		return defaultAWRecycle(), err
+	}
+	item := defaultAWRecycle()
+	if err := json.Unmarshal([]byte(value), &item); err != nil {
+		item = defaultAWRecycle()
+	}
+	return normalizeAWRecycle(item), nil
+}