Add Tailscale Service

You are helping add a new Tailscale-networked Docker service. Follow these steps precisely.

Gather information

Ask the user for (if not already provided):

1. service name – the short slug used for the folder and container names (e.g. mealie, linkding)
2. docker image – the full image reference (e.g. ghcr.io/mealie-recipes/mealie:latest)
3. container port – the port the app listens on inside the container (e.g. 9000, 8080)
4. HTTP service? – does it expose a web UI over HTTP/HTTPS? (yes → create serve.json and use Tailscale Funnel; no → MagicDNS only)
5. display name – human-readable name for Glance (e.g. Mealie, The Lounge)
6. description – short description for Glance (e.g. Meal planner (web client))
7. extra environment variables or volumes – any app-specific config the user wants included

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