feat(games): unify ApplyMove signatures + remove unused player conversion

Updated TicTacToeRules and BattleshipRules to implement ApplyMove(state, playerIdx, payload) (bool, bool, int) as required by GameRules.

Added win/draw resolution logic directly inside each game’s ApplyMove return.

Removed obsolete convertToGamePlayers helper.

Updated GenericMatch to call AssignPlayerSymbols with []*structs.Player directly.

Ensured all rule implementations now fully satisfy the GameRules interface.

plugins/main.go

@@ -22,11 +22,6 @@ func InitModule(
 	//--------------------------------------------------------
 	// 1. Register RPCs
 	//--------------------------------------------------------
-	if err := initializer.RegisterRpc("hello_world", HelloWorld); err != nil {
-		logger.Error("Failed to register RPC hello_world: %v", err)
-		return err
-	}
-
 	if err := initializer.RegisterRpc("leave_matchmaking", modules.RpcLeaveMatchmaking); err != nil {
 		logger.Error("Failed to register RPC leave_matchmaking: %v", err)
 		return err