Feature Request: Add gPodder Sync Support (Nextcloud & OpodSync)

[racuna]

Hello.

It would be great if PodAura could support synchronization with gPodder
-compatible servers, allowing users to sync their podcast subscriptions and playback positions across multiple devices.

There are currently two major open implementations of the gPodder API that can be used for testing and verification:

Nextcloud gPodder – integrated into the Nextcloud ecosystem.

• Test server: https://nch.pl/
• Repo & docs: https://github.com/thrillfall/nextcloud-gpodder

OpodSync – standalone open-source implementation.

• Test servers:
  https://sintoniza.pcdomanual.com/
  https://podsync.ozol.cloud/
• Repo & docs: https://github.com/kd2org/opodsync

Both implementations follow the gPodder API specification
with some minor variations.

Ideally, PodAura could allow users to configure the server URL, username, and password manually (as in AntennaPod or Podcast Addict).

Thanks for this great app