Pin distrobox, add known limitations and a bug-report script

The installer clones distrobox 1.8.2.5 instead of the latest code, so an
upstream change can't break new installs. scripts/report.sh collects
versions, service states, settings, and logs for an issue, with Bluetooth
addresses and the headset serial masked. The README lists the known
limitations and how to report problems.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -4,3 +4,4 @@ target/
 .env.*
 captures/
 __pycache__/
+frametop-report-*.txt