feat(widget): 添加评论图片灯箱预览功能

- 新增 ImagePreview 组件用于全屏查看评论中的图片
- 在功能设置中添加图片灯箱模式开关选项
- 扩展媒体元素样式限制，支持视频和 iframe 的尺寸控制
- 更新前后端 API 以支持 enableImageLightbox 配置项
- 优化设置页面布局，使用卡片式分组展示功能项

cwd-api/src/api/admin/featureSettings.ts

@@ -25,6 +25,10 @@ export const updateFeatureSettings = async (c: Context<{ Bindings: Bindings }>)
 			typeof body.enableArticleLike === 'boolean'
 				? body.enableArticleLike
 				: undefined;
+		const enableImageLightbox =
+			typeof body.enableImageLightbox === 'boolean'
+				? body.enableImageLightbox
+				: undefined;
 		const rawCommentPlaceholder =
 			typeof body.commentPlaceholder === 'string' ? body.commentPlaceholder : undefined;
 		const commentPlaceholder =
@@ -37,6 +41,7 @@ export const updateFeatureSettings = async (c: Context<{ Bindings: Bindings }>)
 		await saveFeatureSettings(c.env, {
 			enableCommentLike,
 			enableArticleLike,
+			enableImageLightbox,
 			commentPlaceholder,
 			visibleDomains
 		});