Linthra 0.1.12 — clean reinstalls and safer Android data handling.

- Reinstalling Linthra no longer restores stale songs, settings, server state, or inaccessible folder references.
- Switching from a debug APK to stable now starts with a clean library after uninstall.
- Normal in-place updates still keep accounts, playlists, settings, catalog, and cache.
- Android cloud backup and device transfer now exclude Linthra's rebuildable private state.
- No ads, tracking, analytics, or telemetry.
