- Add default_ttl parameter for records without explicit TTL values
- Change diff format to standard DNS zone file format for better readability
- Remove section headers and use standard zone file notation:
* - for deleted records
* + for added records
* Show both old and new for changed records
- Fix newline handling in diff output (actual newlines instead of escaped strings)
- Align columns for FQDN, TTL, record type, and value
- Include TTL in diff output for all record operations