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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Assisted-by: Crush:glm-5.2

Package-Workspace/Automation/windmill/CloudronManifest.json

@@ -0,0 +1,25 @@
+{
+  "version": 1,
+  "manifestVersion": 2,
+  "type": "app",
+  "id": "io.cloudron.windmill",
+  "title": "Windmill",
+  "description": "Windmill is an open-source workflow automation platform. Turn scripts (Python, JS/TS, Go, Bash, SQL, PHP, Rust, PowerShell) into sharable HTTP endpoints and background jobs, chain them into flows, and build internal apps on top. Uses PostgreSQL for state and queuing (no Redis required).",
+  "author": "Windmill Labs",
+  "website": "https://www.windmill.dev",
+  "contactEmail": "cloudron@tsys.dev",
+  "tagline": "Open-source workflow automation and internal apps platform",
+  "version": "1.514.1",
+  "healthCheckPath": "/api/version",
+  "httpPort": 8000,
+  "memoryLimit": 2048,
+  "addons": {
+    "localstorage": true,
+    "postgresql": {
+      "version": "14"
+    }
+  },
+  "mediaLinks": [],
+  "changelog": "Initial Cloudron package for Windmill. PostgreSQL-backed (no Redis); single-container server mode with embedded worker. OIDC/SAML supported via the in-app Admin Settings.",
+  "icon": "file://logo.png"
+}