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>

libs/service/src/api/admin/index.ts

@@ -7,7 +7,6 @@ import type {
 
 const ADMIN_BASE_URL = '/admin';
 
-// Admin Users
 export const getAdminUsers = async (params?: {
   page?: number;
   per_page?: number;
@@ -26,7 +25,6 @@ export const getAdminUsers = async (params?: {
   return response.data;
 };
 
-// Admin Teams
 export const getAdminTeams = async (params?: {
   page?: number;
   per_page?: number;
@@ -39,7 +37,6 @@ export const getAdminTeams = async (params?: {
   return response.data;
 };
 
-// Admin Submissions
 export const getAdminSubmissions = async (params?: {
   page?: number;
   per_page?: number;