feat: add Windmill Cloudron package (Automation)

Windmill is an open-source workflow-automation / internal-apps platform
that turns scripts (Python, JS/TS, Go, Bash, SQL, Rust, ...) into HTTP
endpoints, scheduled jobs, and visual flows. It is PostgreSQL-only —
it uses Postgres LISTEN/NOTIFY for job queuing, so no Redis is required,
making it a clean Cloudron fit.

- Wraps the official ghcr.io/windmill-labs/windmill:1.514.1 image in
  single-container server mode (embedded default worker)
- start.sh composes DATABASE_URL from the Cloudron postgresql addon and
  waits for the DB (bash /dev/tcp, no pg_isready dependency)
- HTTP port 8000, health check on /api/version, 2GB memory limit
- OIDC/SAML supported via the in-app Admin Settings UI (post-install)
- Validated end-to-end: throwaway postgres + windmill ran migrations and
  returned /api/version => "CE v1.514.1", HTTP 200

Gardening: STATUS/README/JOURNAL updated (9/~57 packaged; Automation
1/4). Windmill logged as a new OIDC-preferred completed package.

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Package-Workspace/Automation/windmill/CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelog
+
+## 1.514.1 — Initial Cloudron package
+
+- First Cloudron package for Windmill
+- Wraps the official `ghcr.io/windmill-labs/windmill:1.514.1` image
+- Single-container server mode (embedded default worker)
+- PostgreSQL-backed via the Cloudron `postgresql` addon (no Redis required)
+- `start.sh` derives `DATABASE_URL` from Cloudron env and waits for the DB
+- HTTP port 8000, health check on `/api/version`
+- OIDC/SAML supported via the in-app Admin Settings UI (post-install config)