chore: upgrade dependencies, restructure shared libs, and fix UI

- Upgrade Nx 22.1.1 → 22.6.3 and all patch/minor dependencies
- Restructure shared libs: move business logic from utils to service
- Consolidate shadcn-ui into ui lib with atomic design pattern
- Fix container centering for landing app (Tailwind v4 compatibility)
- Fix button styling by updating @source directive in globals.css
- Fix SiCss3 → SiCss rename in react-icons 5.6
- Fix duplicate useSession export conflict
- Remove dead code, comments, and unused files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/gacha/src/middleware.ts

@@ -1,15 +1,5 @@
-// import { SessionToken, SessionUser } from '@imphnen-frontend-service/utils';
 import { LoaderFunctionArgs } from 'react-router';
 
-// const mappingPublicRoutes = ['/'];
-
-// const mappingRoutePermissions = [
-//   {
-//     path: '/',
-//     permissions: [],
-//   },
-// ];
-
 export const middleware = async ({ request }: LoaderFunctionArgs) => {
   return null;
 };