Complete email router implementation and documentation

- Cleaned up interface definitions to only include implemented features
- Updated readme.md with comprehensive route-based configuration examples
- Added common email routing patterns and troubleshooting guide
- Removed legacy DomainRouter and IDomainRule interfaces
- Updated all imports and exports to use new EmailRouter system
- Verified build and core functionality tests pass

The match/action pattern implementation is now complete and production-ready.

ts/mail/routing/index.ts

@@ -1,6 +1,4 @@
 // Email routing components
-export * from './classes.domain.router.js';
-export * from './classes.email.config.js';
 export * from './classes.email.router.js';
 export * from './classes.unified.email.server.js';
 export * from './classes.dnsmanager.js';