Ping already reused Musify's Zitadel and SeaweedFS, but did so through a
hardcoded relative path into Musify's own deploy folder
(../../../Musify/MusifyM/deploy/zitadel/.output), which only worked
because Musify happened to be the one running them. Those services now
live in a separate Infrastructure repository instead, so this points
there.
Also drops Ping's own Postgres container in favor of Infrastructure's
shared instance (its own ping_db database), with a wait-for-postgres
one-shot replacing the in-file health check.
.NET 10 solution for Ping, a Discord style chat app: Domain, Application
and Infrastructure projects plus the Api host. SignalR for chat and
presence, LiveKit for call tokens, EF Core on Postgres, S3 compatible
storage for attachments, and OIDC auth shared with the Musify Zitadel
instance. Includes the Compose stack for local development.