test: add @QuarkusTest integration tests for GameRegistry and GameResource
Add QuarkusTest integration tests for:
- GameRegistryImpl: store, get, update, generateId
- GameResource: createGame, getGame, makeMove, getLegalMoves, resignGame,
undoMove, redoMove, drawAction, importFen, importPgn, exportFen, exportPgn
Tests run and pass but Scoverage doesn't instrument @QuarkusTest classes.
Coverage won't be reported in metrics, but correctness is verified.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Janis
626e1a62ab