Apply the same Redis fix from the immich addon to immich_cuda:
- Remove DOCKER_MODS env var from Dockerfile and config.yaml
- Add redis-server to PACKAGES for direct installation
- s6-rc service files, redis.conf, and 20-folders.sh were already updated
This prevents ECONNRESET errors caused by Docker mods failing to install
Redis at runtime (issue #2615).
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: alexbelgium <44178713+alexbelgium@users.noreply.github.com>
