Add white-label configuration for derail.me integration

- White-label config system for unbranded deployments
- Derail.me specific configuration (no Chitty branding)
- Build scripts for white-label packaging
- Platform integration documentation
- Dual-brand strategy: ChittyPro (standalone) + Derail (white-label)
- Environment configuration for white-label mode
- Complete white-label deployment guide

ChittyPro Streamlink remains standalone in ChittyApps portfolio
Derail.me gets clean white-label module integration

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

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

Author: chitcommit