feat: 重构内容列表接口，使用过滤器结构体简化参数传递；更新相关服务和测试用例

backend/app/http/v1/content.go

@@ -25,17 +25,12 @@ type Content struct{}
 // @Param sort query string false "Sort order" Enums(latest, hot, price_asc)
 // @Param page query int false "Page number"
 // @Success 200 {object} requests.Pager{items=[]dto.ContentItem}
-// @Bind keyword query
-// @Bind genre query
-// @Bind tenantId query
-// @Bind sort query
-// @Bind page query
+// @Bind filter query
 func (c *Content) List(
 	ctx fiber.Ctx,
-	keyword, genre, tenantId, sort string,
-	page int,
+	filter *dto.ContentListFilter,
 ) (*requests.Pager, error) {
-	return services.Content.List(ctx.Context(), keyword, genre, tenantId, sort, page)
+	return services.Content.List(ctx.Context(), filter)
 }
 
 // Get content detail