feat(portal-shell): implement portal-shell with apollo-router integration

M8: portal-shell unified frontend shell (Modular Monolith + micro-kernel).

- Apollo Client -> apollo-router (port 4010, RSC prefetch)

- 5 layouts: classic/focus/split/triple/canvas

- Registry + PluginLoader (dynamic import ssr:false)

- 3-layer props merge, Zustand PluginStore

- 4 widgets: grades/notification-bell/user-menu/class-selector

- config-service: new pluginConfig GraphQL resolver

- apollo-router: CORS + header propagation for portal-shell

- docker-compose.yml: portal-shell service block

apps/portal-shell/package.json

@@ -0,0 +1,43 @@
+{
+  "name": "@edu/portal-shell",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev -p 4010",
+    "build": "next build",
+    "start": "next start -p 4010",
+    "lint": "eslint src",
+    "lint:tokens": "eslint -c .eslintrc.tokens.js src",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "dependencies": {
+    "@apollo/client": "^3.11.0",
+    "@edu/hooks": "workspace:*",
+    "@edu/ui-components": "workspace:*",
+    "@edu/ui-tokens": "workspace:*",
+    "graphql": "^16.8.0",
+    "next": "^14.2.0",
+    "react": "^18.3.0",
+    "react-dom": "^18.3.0",
+    "swr": "^2.2.0",
+    "zustand": "^4.5.0"
+  },
+  "devDependencies": {
+    "@testing-library/jest-dom": "^6.4.0",
+    "@testing-library/react": "^16.0.0",
+    "@types/node": "^22.0.0",
+    "@types/react": "^18.3.0",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.0",
+    "autoprefixer": "^10.4.0",
+    "eslint": "^9.0.0",
+    "eslint-config-prettier": "^9.1.0",
+    "jsdom": "^25.0.0",
+    "postcss": "^8.4.0",
+    "tailwindcss": "^3.4.0",
+    "typescript": "^5.6.0",
+    "vitest": "^2.0.0"
+  }
+}