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/backoffice.ts

@@ -1,11 +1,8 @@
 import axios from 'axios';
 import { useAuthStore } from '../hooks/auth';
 
-// Backoffice Backend API Base URL
-// In development, use proxy; in production, use full URL
 const BACKOFFICE_API_URL = 'https://api.hackathon.imphnen.dev/api/v1';
 
-// Create axios instance for backoffice backend
 export const backofficeApi = axios.create({
   baseURL: BACKOFFICE_API_URL,
   headers: {
@@ -13,7 +10,6 @@ export const backofficeApi = axios.create({
   },
 });
 
-// Add auth token interceptor
 backofficeApi.interceptors.request.use(
   (config) => {
     const { session } = useAuthStore.getState();
@@ -27,11 +23,9 @@ backofficeApi.interceptors.request.use(
   }
 );
 
-// Error handling interceptor
 backofficeApi.interceptors.response.use(
   (response) => response,
   (error) => {
-    // Handle 401 - clear session and redirect to login
     if (error.response?.status === 401) {
       const isAuthPage =
         globalThis.window !== undefined &&
@@ -45,18 +39,15 @@ backofficeApi.interceptors.response.use(
       }
     }
 
-    // If backend sends a message, use it
     const backendMsg = error?.response?.data?.message;
     if (backendMsg && typeof backendMsg === 'string') {
       return Promise.reject(new Error(backendMsg));
     }
 
-    // Fallback error message
     return Promise.reject(new Error(error.message || 'An error occurred'));
   }
 );
 
-// Response type
 export interface BackofficeApiResponse<T> {
   data: T;
   message: string;