Added comprehensive documentation:
1. ADDON_HOOK_SYSTEM.md
- WordPress-style hook system for React
- Zero coupling between core and addons
- Addons register via hooks (no hardcoding)
- Type-safe filter/action system
2. BITESHIP_ADDON_SPEC.md (partial)
- Plugin structure and architecture
- Database schema for Indonesian addresses
- WooCommerce shipping method integration
- REST API endpoints
- React components specification
Key Insight:
✅ Hook system = Universal, no addon-specific code
❌ Hardcoding = Breaks if addon not installed
Next: Verify shipping settings work correctly
