feat(portal-shell): v2.0 P0 shadcn standardization + security + streaming + error handling

- shadcn/ui 标准化：废弃纸感令牌，统一 bg-background/text-foreground 等
- Tailwind v4 + @theme inline，移除 tailwind.config.js
- React 19 use() + Suspense 流式渲染，首屏骨架秒出
- 三级错误边界：Route → Section → Widget 层层兜底
- 错误上报：useErrorReport → sendBeacon → /api/log mock 端点
- 三层安全边界：L1 角色门禁 / L2 权限点门禁 / L3 数据范围
- 权限位图 base36 压缩：67 权限点 → ~14 字符，JWT 体积减少 ≥ 99%
- notify 统一 Toast 封装，禁止业务直接 import sonner
- PluginBoundary 替代 PluginLoader（错误边界 + Suspense + Skeleton 三件套）

验证：typecheck 0 错误 / lint 0 错误 / build 6 路由生成成功

packages/ui-components/package.json

@@ -10,15 +10,17 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@edu/ui-tokens": "workspace:*"
+    "@edu/ui-tokens": "workspace:*",
+    "clsx": "^2.1.1",
+    "tailwind-merge": "^3.4.0"
   },
   "peerDependencies": {
-    "react": "^18.3.0",
-    "react-dom": "^18.3.0"
+    "react": "^18.3.0 || ^19.0.0",
+    "react-dom": "^18.3.0 || ^19.0.0"
   },
   "devDependencies": {
-    "@types/react": "^18.3.0",
-    "@types/react-dom": "^18.3.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "typescript": "^5.6.0"
   }
 }