Complete trainer compensation lifecycle:
- 7 migrations (trainer_compensations, payroll_periods, payslips, payslip_items, trainer_advances, trainer_rate_history + make employee_id nullable for freelancers)
- 7 enums, 6 models with proper relationships
- CompensationCalculatorService: auto-calculates session/player/revenue/penalty earnings
- PayrollService: period management, bulk payslip generation, approval workflow, payment recording
- TrainerAdvanceService: salary advance/loan lifecycle with installment tracking
- Event listeners: AttendanceMarked → auto-compensation, SessionCancelled → trainer pay
- 4 Livewire pages: PayrollDashboard, TrainerCompensations, PayslipDetail, TrainerAdvances
- Sidebar navigation + routes with permission middleware
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>