* remove legacy data bridge, RPC, and server bootstrap files
* simplify lobby scene and node hierarchy
* rename lobby UI scene path and update signal handlers
* replace the application icon and configure the boot splash
* add project description and version metadata
* Add local message bus emission with optional argument expansion
* Improve message type validation and callback dispatch
* Simplify lobby match join/disconnect handling
* Move lobby server networking toward an overridable `ServerNetworking` base class
* Update lobby scene to use the dedicated lobby server script
* Remove obsolete window configuration and unused RPC stubs
