- Add `Artist` entity with JPA annotations and database mapping.
- Create repository, service, and delegate handlers for Artist CRUD operations.
- Register handlers (`artist.create`, `artist.getAll`, `artist.getById`, `artist.update`, `artist.delete`) in `DelegateActionManager`.
- Introduce Protobuf definitions for Artist messages.
- Update `initializeServices` in `DelegateActionManager` for Artist service support.
- Add null-safe ID handling in `ArtistMapper` to prevent potential NPEs.
- Extend `test.proto` with `CloseCommand` and `CloseResponse` messages.
- Introduce `CloseHandler` to process "close" actions and respond with connection termination notice.
- Update `DelegateActionManager` to register `CloseHandler`.
- Refactor `IPCManager` to handle "close" response headers and terminate client connections gracefully.
- Extend `test.proto` schema with heartbeat and echo message definitions.
- Register `HeartbeatHandler` in `DelegateActionManager`.
- Refactor Log4j2 configuration to standardize log levels.
- Optimize client wait time in `IPCManager` for reduced latency.
- Replaced `SimpleProtocol` with `TransportProtocol` in `IPCManager`.
- Added `DelegateActionManager` to route requests to handlers, starting with `EchoHandler`.
- Updated `MediaManagerApplication` to initialize and manage `DelegateActionManager`.
- Extended Protocol Buffers schema with `Request` and `Response` definitions.
- Enhanced logging for request processing and redesigned response flow.
- Created `messages.proto` to define `TextMessage` schema.
- Integrated Protocol Buffers Java library into Maven dependencies.
- Configured Maven plugins for Protocol Buffers compilation and generated source management.
- Implemented message serialization and deserialization in `IPCManager`.
- Enhanced client handling to process and respond with Protocol Buffers messages.