- Rename DnsValidator to DnsManager to better reflect its expanded responsibilities
- Move DNS record creation logic from UnifiedEmailServer to DnsManager
- Add ensureDnsRecords() method that handles both validation and creation
- Consolidate internal DNS record creation (MX, SPF, DMARC) in one place
- Keep DKIM key generation in UnifiedEmailServer but move DNS registration to DnsManager
- Update all imports and tests to use DnsManager instead of DnsValidator
- Improve code organization and discoverability of DNS functionality
- Add StorageManager with filesystem, custom, and memory backends
- Update DKIMCreator and BounceManager to use StorageManager
- Remove component-level storage warnings (handled by StorageManager)
- Fix list() method for filesystem backend
- Add comprehensive storage and integration tests
- Implement DNS mode switching tests
- Complete Phase 4 testing tasks from plan