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

services/classes/src/main.ts

@@ -1,3 +1,4 @@
+import "@edu/shared-ts/env-loader";
 import "reflect-metadata";
 import { NestFactory } from "@nestjs/core";
 import { AppModule } from "./app.module.js";

services/classes/src/shared/observability/logger.ts

@@ -1,17 +1,16 @@
-import pino from 'pino';
-import { env } from '../../config/env.js';
+import { pino } from "pino";
+import { env } from "../../config/env.js";
 
 export const logger = pino({
   level: env.LOG_LEVEL,
-  // 修复：pino 默认字段选项为 `base`，而非 `defaultFields`
   base: {
-    service: 'classes',
-    version: '0.1.0',
+    service: "classes",
+    version: "0.1.0",
   },
   transport:
-    env.NODE_ENV === 'development'
+    env.NODE_ENV === "development"
       ? {
-          target: 'pino-pretty',
+          target: "pino-pretty",
           options: { colorize: true },
         }
       : undefined,