- Change audiobooks and audiobookChapters tables to use composite PK (id, userId)
- Migrate audiobooks from flat storage to user-specific directories under audiobooks_users
- Add support for claiming unclaimed audiobooks on account creation
- Improve auth rate limiting with retry logic and DISABLE_AUTH_RATE_LIMIT for tests
- Fix iOS/Safari audio playback with unlock mechanism and playback rate watchdog
- Update API routes to handle user-scoped audiobook access with fallback to unclaimed
- Transfer audiobooks when linking anonymous accounts to real accounts
- Remove foreign key constraint from audiobookChapters to support composite PK
- Add cascade delete to account and session foreign keys
c24710b2ca