refactor(settings): consolidate user profile into single settings page

Drop the standalone /settings/profile route + user-profile component;
folding the same fields into user-settings means one place to update
and one menu item. UserMenu loses the Profile dropdown entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/(dashboard)/[portSlug]/settings/profile/page.tsx

@@ -1,5 +0,0 @@
-import { UserProfile } from '@/components/settings/user-profile';
-
-export default function ProfilePage() {
-  return <UserProfile />;
-}