initial scaffold: emdash catalog, helm chart, woodpecker pipeline, ddev

- app/: Emdash scaffold (Astro 6, node target) with cmses/plugins/pages collections
- app/seed/seed.json: WordPress→Emdash parity for kotkanagrilli.fi (~30 entries)
- Dockerfile + docker/entrypoint.sh: multi-stage build, single PVC at /app/state
- deploy/helm/: chart mirroring emdash-kotkanagrilli (single-replica, sqlite, kotkan)
- deploy/fleet-overlay/: HelmRelease/source/image-automation templates for
  anton-helm-workloads (staging + production)
- .woodpecker/container.yaml: arm64 build, three OCI tags per push
  (immutable 0.1.<pipeline> + floating <branch> + <branch>-latest)
- .ddev/: local dev with nginx proxy to emdash on :4321
- README/DEPLOYMENT/ARCHITECTURE/CLAUDE: docs covering the three-repo
  pipeline (cms-plugins + anton-helm-workloads + Gitea OCI registry)

docker/entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -eu
+
+# Ensure persistent state dirs exist (volume may be empty on first boot).
+mkdir -p /app/state/uploads
+
+# Bootstrap on first run: create data.db and apply migrations.
+# emdash init is expected to be idempotent on subsequent boots.
+if [ ! -f /app/state/data.db ]; then
+  echo "[entrypoint] no data.db found in /app/state, running emdash init"
+  node_modules/.bin/emdash init
+fi
+
+exec "$@"