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/README.md

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+# Windmill Cloudron Package
+
+## Description
+
+Windmill is an open-source developer platform to turn scripts into workflows
+and internal apps. Write scripts in Python, JavaScript/TypeScript, Go, Bash,
+SQL, PHP, Rust, PowerShell, or Deno; Windmill turns them into sharable HTTP
+endpoints, cron-scheduled jobs, and steps in visual **Flows**. It also
+generates internal apps from those flows.
+
+This package wraps the official `ghcr.io/windmill-labs/windmill` image in
+single-container **server mode** (the server embeds a default worker, so no
+separate worker container is needed).
+
+State lives entirely in **PostgreSQL** (Cloudron `postgresql` addon). Windmill
+uses Postgres `LISTEN/NOTIFY` for job queuing, so **no Redis is required**.
+
+## Authentication
+
+Windmill supports **OIDC** and **SAML** natively. Unlike many apps, these are
+configured in the **in-app Admin Settings UI** (persisted in the database),
+not via environment variables.
+
+### Post-install OIDC setup (recommended)
+
+1. Open the Windmill app and sign in as the bootstrap superadmin (the first run
+   prints a `SUPERADMIN_SECRET` / creates an admin — see Windmill docs).
+2. Go to **Admin Settings → Auth → OIDC**.
+3. Enter your identity provider details (Cloudron's OIDC provider issuer,
+   client ID, and client secret). The platform OIDC issuer / client creds come
+   from your Cloudron instance's app SSO configuration.
+4. Save; users can then log in via OIDC.
+
+> OIDC is the preferred auth path for this app. Until OIDC is configured,
+   access is limited to the local superadmin account.
+
+## Features
+
+- **Scripts to endpoints**: any script becomes a typed HTTP API + background job
+- **Flows**: visually chain scripts with branching, loops, retries, error handling
+- **Schedules**: cron-based job scheduling
+- **Apps**: generate internal UIs from flows
+- **Multi-language**: Python, JS/TS, Go, Bash, SQL, PHP, Rust, PowerShell, Deno
+- **Secrets**: encrypted secret management with inheritance
+- **Queuing**: Postgres `LISTEN/NOTIFY` (no external broker)
+
+## Configuration
+
+### Ports
+- **8000**: Windmill web UI + REST API
+
+### Addons
+- **postgresql** (v14): all persistent state, jobs, flows, users, queue
+- **localstorage** (`/app/data`): ephemeral job working files
+
+### Environment Variables
+The `start.sh` entrypoint derives `DATABASE_URL` automatically from the
+Cloudron PostgreSQL addon. The only fixed knob is:
+
+| Variable | Default | Purpose |
+|----------|---------|---------|
+| `MODE` | `server` | Run mode (server embeds a default worker) |
+
+`DATABASE_URL` is composed at runtime as
+`postgres://$USER:$PASS@$HOST:$PORT/$DB?sslmode=disable`.
+
+## Usage
+
+1. Install the package on Cloudron (provisions a PostgreSQL database).
+2. On first boot, Windmill runs migrations and bootstraps a superadmin.
+3. Sign in, then immediately configure OIDC under Admin Settings (above).
+4. Create a script, expose it as a flow/app, schedule it, or call its HTTP endpoint.
+
+## Upstream
+
+- **Repository**: https://github.com/windmill-labs/windmill
+- **Image**: `ghcr.io/windmill-labs/windmill:1.514.1`
+- **Docs**: https://www.windmill.dev/docs