v2.12.0

1. Renamed release file main to drivershub; Removed launcher
2. Optimized app startup
   • Moved database initialization logic to main setup init-db command
   • This avoids unnecessary database queries on each startup
3. Added timeout_worker_healthcheck=120 in uvicorn.run config
   • This should prevent "child process died" issue on low-spec servers
4. Replaced parent with master in command line arguments
   • master refers to the main controller in multihub
   • This ensures consistency with master-db related arguments
   • This also removes the confusion with "parent server process"
5. Migrated master-db related command line arguments to environment variables
   • MASTER_DB_HOST, MASTER_DB_USER, MASTER_DB_PASSWORD, MASTER_DB_POOLSIZE
   • This would prevent leaking credentials through process list
6. Refactored prefixed redis implementation for more elegant approach
7. Refactored tracker data handling to use a centralized function
8. Fixed wrong string table key in PATCH /user/profile response
9. Fixed naive datetime that depends on system timezone
   • Added explicit utc timezone
10. Removed protection on config.trackers secrets in GET|PATCH /config for admin
    • This allows original secrets to be viewed and reused
    • This allows empty values to be written even without unsafe=True
    • The risk is deemed to be minimal and the benefit on convenience is justified