fix: Harden LNbits CLN REST startup

[macterra]

Summary

• wait for an authenticated CLN REST before starting LNbits
• fail startup instead of falling back into broken mode when CLN REST is not ready
• restart LNbits automatically so transient boot races self-heal

Verification

• restarted with
• confirmed fresh logs show
• confirmed LNbits starts on and logs

[Copilot]

Pull request overview

This PR hardens LNbits startup when using the CLN REST wallet by blocking startup until CLN REST is reachable and authenticated, and by configuring Docker to restart LNbits so transient boot races can self-heal.

Changes:

• Require CLNREST_READONLY_RUNE and perform an authenticated /v1/listfunds readiness check before launching LNbits.
• Fail startup (exit non-zero) instead of starting LNbits in a known-broken mode when CLN REST isn’t ready within the timeout.
• Add restart: unless-stopped to the LNbits service in the lightning compose stack.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
scripts/lnbits-entrypoint.sh	Adds authenticated CLN REST readiness gating and fails fast when CLN REST isn’t ready.
docker-compose.lightning.yml	Ensures LNbits is restarted automatically to recover from transient startup races.

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