Admin Panel Frontend

Added

• Admin dashboard — Pulse metrics for MRR, users, trials, and system health
• User management — Search, filters, inline actions, 360 detail view with activity log
• Organisation management — Plan and status filters, subscription info, Stripe links
• System settings — Maintenance mode, registration toggle, trial day configuration
• Audit log — Paginated log viewer
• System health — Database and Stripe webhook status monitoring
• OmniSearch — Cmd+K quick navigation across admin panel
• Impersonation — View as any user with safety banner and audit trail