Updating client app is not required.

Key improvements:

- Full-fledged IPv6 support

- Compression using brotli algorithm

- Persistent data is now backed to drive every 1 hour and is restored after each server restart.

- Existing persistent data restored from latest available full image (timestamp: `2025-05-18 10:02:39.094389128 +0200`)

- Internal performance improvements

- Migration to unix domain socket

- Fixed a few edge-case crashes