chore: replace alby mutinynet lsps2 with megalith mutinynet lsp

[rolznz]

Summary by CodeRabbit

• Bug Fixes
  • Updated the fallback liquidity provider used on signet when no custom LSPS2 source or peer suggestion is available.
  • Switched to a newer default endpoint and connection details for improved compatibility and reliability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6f98f225-18a5-4cd0-9d06-306cb349e042

📥 Commits

Reviewing files that changed from the base of the PR and between 222031a and 9a72a66.

📒 Files selected for processing (1)

• lnclient/ldk/ldk.go

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📝 Walkthrough

Walkthrough

In lnclient/ldk/ldk.go, the hardcoded signet fallback LSPS2 liquidity source in NewLDKService was changed from the Alby LSP (Mutinynet) endpoint to the Megalith LSP 2 (Mutinynet) endpoint, updating the pubkey/host/port value and its comment.

Signet Fallback LSP Update

Layer / File(s)	Summary
Signet default LSPS2 endpoint lnclient/ldk/ldk.go	Replaces the Alby LSP (Mutinynet) pubkey@host:port with the Megalith LSP 2 (Mutinynet) equivalent and updates the associated comment.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A hop and a skip, the LSP has changed,
From Alby to Megalith, endpoints rearranged.
On signet we test with mutinynet flair,
New pubkey and port floating through the air.
🐇 All is well in the liquidity lair!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately describes the main change: swapping the Mutinynet LSPS2 fallback from Alby to Megalith.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/megalith-mutinynet-lsps2

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