refactor: 移除样例页（tutorial design-examples / design-lab shelf）——组件页已含 RouteLine 演示，样例使命完成；导航/目录/视觉基线/散落契约同步清理，25/25 绿（Scatter 组件保留在包中）

apps/design-lab/src/pages/index/App.tsx

@@ -2,7 +2,6 @@ const PAGES = [
   { href: '/colors.html', name: '01 颜色', desc: '撞色对 · 中性阶 · 章节色 · 反例' },
   { href: '/symbols.html', name: '02 符号形状', desc: '语义形状 · 词汇表 · 线形 · 票券' },
   { href: '/components.html', name: '03 组件', desc: 'CourseCard · RouteLine · 票券 · 指派块 · 入口' },
-  { href: '/shelf.html', name: '04 样例', desc: '组合场景——实现验收对照图' },
 ]
 
 export function App() {

apps/design-lab/src/pages/shelf/App.tsx

@@ -1,47 +0,0 @@
-/** 组合场景＝大部分组件拿出来的真实使用，不做解释性标注：
- * 入口画像 → 课程卡与关系线 → 进度票券 → 指派块；形状散落于卡片附近空当。 */
-import { Page } from '../../lib/ui'
-import { ASSIGNMENT, CHAPTERS, PROFILES } from '../../lib/chapters'
-import { MemphisCard } from '@stack/design-system'
-import { AssignBlock, Ticket } from '@stack/design-system'
-import { EntryGuide } from '@stack/design-system'
-import { Scatter } from '@stack/design-system'
-import { Cross, Ring, Tremble, Tri, Wave } from '@stack/design-system'
-
-export function App() {
-  return (
-    <Page
-      tag="<Examples />"
-      title="样例 · 组合场景"
-      desc="大部分组件同台真实使用：入口画像 → 课程卡与关系线 → 进度票券 → 指派块；形状散落于卡片附近空当。"
-    >
-      <EntryGuide chapters={CHAPTERS} profiles={PROFILES} />
-      <div className="relative mt-8 h-[600px] overflow-hidden rounded-2xl bg-paper">
-        <Scatter
-          shapes={[
-            <Tri size={26} key="tri" />,
-            <Ring size={22} key="ring" />,
-            <Cross size={20} key="cross1" />,
-            <Cross size={18} key="cross2" />,
-            <Wave size={44} key="wave" />,
-            <Tremble size={20} key="tremble" />,
-          ]}
-        />
-        <div className="absolute left-[40px] top-[110px] w-[250px]">
-          <MemphisCard chapter={CHAPTERS[1]} entry={1} />
-        </div>
-        <div className="absolute left-[380px] top-[44px] w-[250px] -rotate-1">
-          <MemphisCard chapter={CHAPTERS[2]} entry={2} />
-        </div>
-        <div className="absolute left-[700px] top-[44px] w-[140px]">
-          <MemphisCard chapter={CHAPTERS[5]} compact />
-        </div>
-        <div className="absolute left-[820px] top-[320px]"><AssignBlock {...ASSIGNMENT} /></div>
-        <div className="absolute left-[60px] top-[440px] flex gap-4">
-          <Ticket chapter={CHAPTERS[2]} done />
-          <Ticket chapter={CHAPTERS[5]} done={false} />
-        </div>
-      </div>
-    </Page>
-  )
-}

apps/design-lab/src/pages/shelf/main.tsx

@@ -1,5 +0,0 @@
-import '@stack/design-system/styles/tokens.css'
-import { createRoot } from 'react-dom/client'
-import { App } from './App'
-
-createRoot(document.getElementById('root')!).render(<App />)