chore: refactor structure

internal/error/state.go

@@ -0,0 +1,17 @@
+package error
+
+func NewGameStateError(arg ...any) error {
+	return newGenericError(ErrGameStateInvalid, arg...)
+}
+
+func NewDeleteShipTypeExistingGroupError(arg ...any) error {
+	return newGenericError(ErrDeleteShipTypeExistingGroup, arg...)
+}
+
+func NewDeleteShipTypePlanetProductionError(arg ...any) error {
+	return newGenericError(ErrDeleteShipTypePlanetProduction, arg...)
+}
+
+func NewDeleteSciencePlanetProductionError(arg ...any) error {
+	return newGenericError(ErrDeleteSciencePlanetProduction, arg...)
+}