feat: 新增LED餐品展示屏模块

4800×312超宽长条屏，11格布局。首格为餐厅LOGO，后10格每格展示菜品插图+营养标签+百克价格/热量。10道菜品配本地SVG手绘插图，零外部请求。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

index.html

@@ -887,7 +887,8 @@ const SITE_MAP = [
       {label:'净菜包装贴标秤 · 包装任务', file:'clean-veg-packaging-labeler/01-orders.html'},
       {label:'净菜包装贴标秤 · 包装作业', file:'clean-veg-packaging-labeler/02-labeling.html'},
       {label:'净菜包装贴标秤 · 包装历史', file:'clean-veg-packaging-labeler/03-history.html'},
-      {label:'净菜包装贴标秤 · 标签预览', file:'clean-veg-packaging-labeler/label-preview.html'}
+      {label:'净菜包装贴标秤 · 标签预览', file:'clean-veg-packaging-labeler/label-preview.html'},
+	      {label:'LED餐品展示屏', file:'led-food-display/index.html'}
     ] },
     { name:'蓝牙称小程序', dir:'other-module/bluetooth-scale-miniprogram', entry:'index.html', prd:'other-module/bluetooth-scale-miniprogram/doc/PRD.md', done:true, pages:[
       { file:'doc/design-overview.html', label:'页面总览' },