feat: Add comprehensive Admin Dashboard to HVAC Community Events
- Create Admin Dashboard class with multiple metric categories
- Add health checks for plugin dependencies and system status
- Implement trainer metrics (total registrations, weekly registrations, login tracking)
- Add event statistics (total/past/future/draft/cancelled events, attendee counts)
- Implement revenue statistics (total revenue, weekly revenue, purchase counts)
- Create maintenance controls for cache clearing, database optimization, role regeneration
- Add AJAX-powered metric refresh and CSV export functionality
- Include responsive dashboard UI with metric widgets
- Integrate dashboard into WordPress admin menu under HVAC Community Events
- Add auto-refresh capability (every 5 minutes)
- Include error handling and user notifications
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Co-Authored-By: Claude <noreply@anthropic.com>
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