refactor: 设计系统完整提取为 @stack/design-system 共享包（组件/tokens/类型唯一定义处，双端引用不再拷贝）

- 组件参数化适配双端：MemphisCard href/morph，EntryGuide 数据注入+linkChapter
- RouteLine hover 跟随（站点 translateY(-3)、连线 CSS d 平滑插值、直线变斜线）随包回到 design-lab，shelf 场景接线演示
- tokens.css 显式 @source 包内源码——经 node_modules 解析时自动扫描漏类（text-mute 等静默丢失致 4% 画面偏差，已修复并验证）
- E2E 新增 hover 跟随契约（静置 L 水平、hover 变斜线、双站点 -3px、卡片同步），28/28 全绿

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

@@ -1,9 +1,9 @@
 import { Page, Section } from '../../lib/ui'
-import { ASSIGNMENT, CHAPTERS } from '../../lib/chapters'
-import { MemphisCard } from '../../components/MemphisCard'
-import { AssignBlock, Ticket } from '../../components/Ticket'
-import { EntryGuide } from '../../components/EntryGuide'
-import { Mark } from '../../components/shapes'
+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 { Mark } from '@stack/design-system'
 
 export function App() {
   return (
@@ -33,7 +33,7 @@ export function App() {
         </div>
       </Section>
       <Section label="入口梳理" note="推荐不是强制——无锁">
-        <EntryGuide />
+        <EntryGuide chapters={CHAPTERS} profiles={PROFILES} />
       </Section>
     </Page>
   )