- Add new AdminHandler with methods for dashboard, schedules, users, and bookings
- Implement GetDashboard method to retrieve admin dashboard statistics
- Add CreateSchedule method with validation and error handling
- Implement GetUsers method with pagination support
- Add GetBookings method with pagination and filtering capabilities
- Implement GetFinancialReports method with date range filtering
- Add UpdateSchedule method to modify existing schedule slots
- Enhance error handling and response formatting for admin-related operations
- Integrate admin service methods for comprehensive administrative tasks
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