fix: remove app from recents on close

[ovitrif]

Description

This PR fixes the "Close App" button in the foreground service notification so it actually removes the app from the Android recents drawer.

The previous approach used App.currentActivity?.value?.finishAffinity() which had two problems: the activity reference is always null when the app is backgrounded (making it a no-op), and finishAffinity() doesn't remove from recents anyway.

The fix uses ActivityManager.appTasks to finish and remove all app tasks directly from the service context, after gracefully stopping the LDK node first.

Also fixes the Claude Code Review workflow never posting comments — adds missing --comment flag and --allowedTools for gh CLI (reviews were silently discarded since inception). We can only verify claude[bot] posts review comments on the next PR opened (after merge).

Preview

Before	After
before.mp4	after.mp4

QA Notes

1. Open the app and background it
2. Pull down the notification shade and tap the "Close App" button on the Bitkit service notification
3. Open the Android recents/app drawer
4. Verify the app is no longer listed in recents
5. Repeat step 1-4 with the app in the foreground (activity visible) to confirm it works in both states