- Introduced `admin_handlers.go` to handle database creation requests via HTTP, including validation and response handling.
- Implemented `db_metadata.go` to manage database metadata caching and synchronization with a pubsub subscriber.
- Updated `gateway.go` to initialize the metadata cache and start the metadata subscriber in the background.
- Added new route for database creation in `routes.go` to expose the new functionality.
- Enhanced cluster management to support system database auto-joining and improved metadata handling for database operations.
- Implemented a cleanup goroutine in the pubsub handler to remove old entries from the recent connections map, preventing memory leaks.
- Enhanced the database recovery process in the cluster manager by adding checks for quorum and ensuring proper handling of existing data during instance startup.
- Updated instance management to clear Raft state for leaders with existing cluster state and added background SQL readiness checks for followers.
- Improved logging for better visibility during recovery and instance startup processes.
