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

apps/portal-shell/src/shell/LayoutManager.tsx

@@ -1,17 +1,24 @@
 "use client";
 
 /**
- * LayoutManager - 5 种 Layout 模板渲染器（v2.1 M8）
+ * LayoutManager - 5 种 Layout 模板渲染器（v2.1 M8 + shadcn 令牌）
  *
- * | layoutId | 布局                      | slots                    |
- * | -------- | ------------------------- | ------------------------ |
- * | classic  | TopBar + SideNav + Main   | top / side / main        |
- * | focus    | TopBar + 全宽 Main        | top / main               |
- * | split    | TopBar + 左右等分 Main    | top / main-left / main-right |
- * | triple   | TopBar + SideNav + Main + RightRail | top / side / main / right |
- * | canvas   | TopBar + 自由摆放         | top / canvas-grid        |
+ * | layoutId | 布局                              | slots                              |
+ * | -------- | --------------------------------- | ---------------------------------- |
+ * | classic  | TopBar + SideNav + Main           | top / side / main                  |
+ * | focus    | TopBar + 全宽 Main                | top / main                         |
+ * | split    | TopBar + 左右等分 Main            | top / main-left / main-right       |
+ * | triple   | TopBar + SideNav + Main + RightRail | top / side / main / right        |
+ * | canvas   | TopBar + 自由摆放                 | top / canvas-grid                  |
  *
- * 关联：portal-shell spec §4.1、§4.2
+ * 令牌迁移：v2.0 shadcn 标准令牌
+ * - bg-paper → bg-background（页面底色）
+ * - bg-surface → bg-card（容器表面）
+ * - border-rule → border（默认边框色）
+ * - p-md/p-lg → p-4/p-6（间距阶梯）
+ * - gap-md → gap-4
+ *
+ * 关联：portal-shell spec §4.1、§4.2、README v2.0 §3.5 shadcn 令牌
  */
 import { type ReactNode } from "react";
 import { SlotRenderer, type SlotRendererProps } from "./SlotRenderer";
@@ -47,15 +54,15 @@ interface LayoutShellProps {
 /** classic：TopBar + SideNav + Main */
 function ClassicLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
   return (
-    <div className="flex min-h-screen flex-col bg-paper">
-      <header className="border-b border-rule bg-surface">
+    <div className="flex min-h-screen flex-col bg-background">
+      <header className="border-b bg-card">
         <SlotRenderer slotName="top" layoutId={layoutId} {...slotInput} />
       </header>
       <div className="flex flex-1">
-        <aside className="w-64 border-r border-rule bg-surface p-md">
+        <aside className="w-64 border-r bg-card p-4">
           <SlotRenderer slotName="side" layoutId={layoutId} {...slotInput} />
         </aside>
-        <main className="flex-1 p-lg">
+        <main className="flex-1 p-6">
           <SlotRenderer slotName="main" layoutId={layoutId} {...slotInput} />
         </main>
       </div>
@@ -66,11 +73,11 @@ function ClassicLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
 /** focus：TopBar + 全宽 Main */
 function FocusLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
   return (
-    <div className="flex min-h-screen flex-col bg-paper">
-      <header className="border-b border-rule bg-surface">
+    <div className="flex min-h-screen flex-col bg-background">
+      <header className="border-b bg-card">
         <SlotRenderer slotName="top" layoutId={layoutId} {...slotInput} />
       </header>
-      <main className="flex-1 p-lg">
+      <main className="flex-1 p-6">
         <SlotRenderer slotName="main" layoutId={layoutId} {...slotInput} />
       </main>
     </div>
@@ -80,11 +87,11 @@ function FocusLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
 /** split：TopBar + 左右等分 Main */
 function SplitLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
   return (
-    <div className="flex min-h-screen flex-col bg-paper">
-      <header className="border-b border-rule bg-surface">
+    <div className="flex min-h-screen flex-col bg-background">
+      <header className="border-b bg-card">
         <SlotRenderer slotName="top" layoutId={layoutId} {...slotInput} />
       </header>
-      <div className="flex flex-1 gap-md p-lg">
+      <div className="flex flex-1 gap-4 p-6">
         <section className="flex-1">
           <SlotRenderer
             slotName="main-left"
@@ -107,18 +114,18 @@ function SplitLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
 /** triple：TopBar + SideNav + Main + RightRail */
 function TripleLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
   return (
-    <div className="flex min-h-screen flex-col bg-paper">
-      <header className="border-b border-rule bg-surface">
+    <div className="flex min-h-screen flex-col bg-background">
+      <header className="border-b bg-card">
         <SlotRenderer slotName="top" layoutId={layoutId} {...slotInput} />
       </header>
       <div className="flex flex-1">
-        <aside className="w-64 border-r border-rule bg-surface p-md">
+        <aside className="w-64 border-r bg-card p-4">
           <SlotRenderer slotName="side" layoutId={layoutId} {...slotInput} />
         </aside>
-        <main className="flex-1 p-lg">
+        <main className="flex-1 p-6">
           <SlotRenderer slotName="main" layoutId={layoutId} {...slotInput} />
         </main>
-        <aside className="w-72 border-l border-rule bg-surface p-md">
+        <aside className="w-72 border-l bg-card p-4">
           <SlotRenderer slotName="right" layoutId={layoutId} {...slotInput} />
         </aside>
       </div>
@@ -129,11 +136,11 @@ function TripleLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
 /** canvas：TopBar + 自由摆放 grid（MVP 按 grid 排列，不实现拖拽） */
 function CanvasLayout({ slotInput, layoutId }: LayoutShellProps): ReactNode {
   return (
-    <div className="flex min-h-screen flex-col bg-paper">
-      <header className="border-b border-rule bg-surface">
+    <div className="flex min-h-screen flex-col bg-background">
+      <header className="border-b bg-card">
         <SlotRenderer slotName="top" layoutId={layoutId} {...slotInput} />
       </header>
-      <main className="flex-1 p-lg">
+      <main className="flex-1 p-6">
         <SlotRenderer
           slotName="canvas-grid"
           layoutId={layoutId}