Build the complete admin panel UI at apps/web/app/(admin)/:
- Admin layout with sidebar navigation and ADMIN role guard
- Dashboard page with stats cards and revenue chart
- User management with search, filters, pagination, detail panel, ban/unban
- Listings moderation queue with approve/reject/bulk actions
- KYC review page with document viewer and approve/reject flow
- New reusable UI components: Dialog, Table
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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