Integrated OpenAPI and Swagger plugins for comprehensive API documentation. Added new routes, including settings management (`/settings/*`), guild metadata endpoints (`/guilds/*`), and detailed action status handling. Updated database schema to support guild metadata persistence, revised command subcommand handling for better modularity, and enhanced API key-based authentication for all routes.
Replaced the bot's audio handling system by removing Lavaplayer dependencies and migrating to a Lavalink v4 node. Updated `MusicManager`, `TrackScheduler`, and related classes to utilize the `LavalinkClient`. Refactored playlist and track loading logic, task integrations, and event dispatch to integrate with the remote node. Deprecated the custom Udio source, preserving references for a future plugin port. Documented configuration and deployment details for the new audio architecture.