Replaced unbounded thread pools in `ThreadManager` with bounded `ThreadPoolExecutor` to prevent memory exhaustion under load. Refactored shutdown logic to handle exceptions per-executor, set threads to daemon mode in `BaseThreadFactory`, and aligned synchronization patterns across multiple classes (`TaskManagerImpl`, `ChannelMessagePurger`, and `MusicManager`). Addressed lock cleanup races, double unlock issues, and static collection thread-safety concerns.
Reworked `Settings` class to replace the static singleton pattern with constructor injection of `SettingsProvider`, improving testability and modularity. Updated all affected classes, tests, and configurations to align with the new architecture.
anthorob