Real-time and deployments for self-hosted

Self-hosted instances now get the same live updates and build pipeline as the cloud, from a single prebuilt image on any domain.

• Added a real-time WebSocket service so self-hosted dashboards show live station status, telemetry, and streaming build logs instead of manual refresh.
• Added a build worker that compiles procedure bundles and stores them as deployment artifacts.
• Improved setup with automatic DNS, TLS, secrets, and image checks; documented the new subdomain, requirements, and troubleshooting.