Archify Sync server, Dockerfile and Helm chart

Rust server (axum, yrs, sqlx/PostgreSQL): live shared models over the y-websocket protocol, versions, browser sign-in with PKCE, invites, single sign-on through OIDC, metrics. Docker image on distroless, compose file, and a Helm chart with one pod, optional bundled PostgreSQL and secrets from existing Secrets.

.moon/toolchain.yml

@@ -0,0 +1,7 @@
+$schema: 'https://moonrepo.dev/schemas/toolchain.json'
+rust:
+  version: '1.99.1'
+  components: [clippy, rustfmt]
+node:
+  version: '24.13.1'
+  packageManager: pnpm