Added 'Back to Dashboard' buttons to all admin dashboard pages for improved navigation. Introduced AbortSignal timeouts to API client and middleware requests to prevent hanging network calls. Also enabled messaging customers from the order details page if Telegram info is available.
Introduces new admin dashboard pages for alerts, bans, invites, orders, settings, status, and vendors under app/dashboard/admin/. Moves the main admin page to the new dashboard structure and adds a shared admin layout. Updates sidebar configuration and adds supporting components and hooks for admin features.