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/ui/src/organisms/backoffice-wrapper/backoffice-wrapper.tsx

@@ -45,9 +45,6 @@ export const BackofficeWrapper: FC<TBackofficeWrapperProps> = ({
         </h1>
 
         <div className="flex items-center gap-x-6">
-          {/* <Button type="button" variant="secondary" className="max-h-full p-3">
-            <Icon icon="mdi:bell-outline" className="size-6" />
-          </Button> */}
           <div className="flex items-center gap-x-6">
             <div className="text-neutral-600 font-medium">
               <p className="text-p3">{user?.fullname || 'Full Name'}</p>