#102 UI: Main Navigation Admin Link Integration

Add Admin Panel link to main navigation. Location: api/ui/templates/index.html (or main nav component) Features: - Add 'Admin' link in main navigation - Only visible if user has admin permissions - Dropdown menu with quick links: - Users - Roles - Tokens - Settings - Full Admin Panel - Badge for pending items: - Pending invitations count - Expiring tokens count - Route Handling: - #/admin routes to admin panel - #/admin/users routes to users page - etc. - Active State: - Highlight when in admin section - Breadcrumb shows admin context Integration: - Works with existing routing system - Preserves workflow context when switching With ultra attention to details and correctness. Before closing: write comment summarizing implementation with screenshot.