Part of synonymdev/bitkit-nightly#17

This PR adds a debug-only probeReadiness devtools command so the mainnet Lightning probe E2E tests can inspect the wallet's routing readiness directly, instead of relying on a fixed stabilization delay.

Description

• Adds LightningRepo.probeReadiness() returning a ProbeReadiness snapshot: node running, lifecycle, peers / connected peers, channels / ready / usable, outbound capacity sats, network graph node and channel counts, latest RGS sync timestamp, and sync health, plus a derived ready flag.
• Exposes it via the debug DevToolsProvider as the probeReadiness command (ADB content call), returning a serialized result.
• Adds unit tests covering the ready and not-ready paths.

Debug/test-only (debug source set); no impact on release builds.

Preview

N/A — debug devtools command, no UI.

QA Notes

Manual Tests

• 1. Install a mainnet debug build → adb shell content call --uri content://to.bitkit.devtools --method probeReadiness: returns JSON with ready, peers, channels, and graph counts.
• 2. Funded wallet with synced graph → call again: ready=true, usableChannels>0, graphChannelCount in the tens of thousands.

Automated Checks

• Unit tests added: cover probeReadiness() ready and not-ready paths in app/src/test/.../LightningRepoTest.kt.
• CI: standard compile, unit test, and detekt checks run by the PR bot.

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