Harden privileged shell, alarm recovery, and scheduling

- Secure Shizuku provider permission
- Report real shell exit codes and verify anti-kill tweaks
- Recover interrupted ringing sessions after process death
- Stop instead of fake-ringing when all audio sources fail
- Tear down previous session before overlapping triggers
- Add exact-alarm permission request entry
- Reschedule alarms on TIME_SET without reacting to timezone changes
- Deduplicate and track watchdog state accurately
- Serialize keepalive reconciliation
- Move Shizuku binder transact off the main thread
- Remove unused launcher png and shizuku_install strings

Fix alarm playback race with a single MediaPlayer

Reuse one MediaPlayer for the BT warm-up and looping ringtone, and guard the completion callback so stopping the alarm cannot start another track.

Co-Authored-By: Codex <noreply@openai.com>

Update README.md

[update] Bump version name to 1.2 in build.gradle.kts

change package name

[refactor]

- Added GitHubRepoCard component to display repository information and check for updates.
- Updated AlarmAudioService to handle idle mode and improve notification management.
- Fix some known issues.

remove obsolete release files and metadata