Aligns with the upstream repo rename
(arcodange/homelab-gateway → arcodange/telegram-gateway) so the name
matches the public URL tg.arcodange.fr and Arcodange's naming
conventions.
Adds the homelab-gateway Argo CD Application pointing at
arcodange/homelab-gateway (user space, like dance-lessons-coach).
Image Updater watches gitea.arcodange.lab/arcodange/homelab-gateway:latest
with digest strategy.
Phase 1 of the Telegram webhook gateway — a long-running pod that
receives webhooks (no more polling) and routes per-bot to handler
implementations. Initial bot: @arcodange_factory_bot, slug=factory,
echo handler.
