feat(appboard): add AppBoard service template

[erykkruk]

Adds a one-click template for AppBoard — an open-source, self-hostable ASO (App Store Optimization) tool: manage App Store & Google Play listings, track keyword rankings over time, organize screenshots and publish metadata from one panel.

Stack

• web — admin panel (Next.js 16), exposed on 6600 via the generated domain
• backend — REST API (Elysia/Bun) on 6680, reached internally at http://backend:6680
• postgres — PostgreSQL 18

Files

blueprints/appboard/: docker-compose.yml, template.toml, meta.json, instructions.md, logo.png.

Notes

• Images are public: ghcr.io/erykkruk/appboard-backend:latest, ghcr.io/erykkruk/appboard-web:latest.
• No SMTP required to start: a bootstrap admin is created on first boot from ADMIN_EMAIL / ADMIN_PASSWORD; sign in via "Sign in with a password". SMTP_* is optional (email OTP + report emails).
• ENCRYPTION_KEY is generated and persisted automatically on first boot.
• The panel proxies /api to BACKEND_URL at runtime, so the single published image works unchanged behind the compose service name.
• Verified with the equivalent Compose stack (postgres + backend + web) end-to-end: bootstrap-admin login to dashboard, panel/backend proxy, migrations on boot.

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