feat: add Gitea as Archipelago app with container registry

Gitea app manifest, marketplace entry, nginx proxy, app session config,
image version, package install config. Container registry enabled on
Gitea for fallback image hosting. Trusted registries updated.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/public/assets/img/app-icons/gitea.svg

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