feat: complete promoter payout system implementation

- Add comprehensive payout styling with custom CSS classes for status indicators
- Implement payout index and show views with French translations
- Add payout migration with proper indexes and defaults
- Update database schema with payout-related tables and fields
- Add comprehensive seed data for testing payout functionality
- Include payout CSS in application stylesheet
- Document payout system implementation in AGENT.md
- Add payout feature to BACKLOG.md

This completes the full promoter payout system allowing event organizers
to request and track revenue payouts for completed events.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

BACKLOG.md

@@ -47,6 +47,7 @@
 ## 🚧 Doing
 
 - [x] feat: Payout system for promoters (automated/manual payment processing)
+- [ ] feat: Payout tracking for administrators
 - [ ] feat: Page to display all tickets for an event
 - [ ] feat: Add a link into notification email to order page that display all tickets