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.

charts/archify-sync/ci/local-values.yaml

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+# Local Kubernetes (OrbStack, kind, k3d): the image built by `docker build`,
+# the bundled PostgreSQL, reached with `kubectl port-forward`.
+image:
+  repository: archify-sync
+  tag: local
+  pullPolicy: Never
+publicUrl: http://localhost:18081
+postgresql:
+  enabled: true
+  storage: 1Gi
+config:
+  snapshotIdleSecs: 2
+  logJson: false
+# OrbStack serves LoadBalancer services on localhost.
+service:
+  type: LoadBalancer
+  port: 18081