refactor: executors and routers

* refactor: executors and routers

internal/error/generic.go

@@ -33,6 +33,7 @@ const (
 
 const (
 	ErrInputUnknownRace int = 3000 + iota
+	ErrInputUnknownRelation
 	ErrInputSameRace
 	ErrInputEntityTypeNameInvalid
 	ErrInputEntityTypeNameDuplicate
@@ -78,6 +79,8 @@ func GenericErrorText(code int) string {
 		return "Invalid game state"
 	case ErrInputUnknownRace:
 		return "Race name is unknown to this game"
+	case ErrInputUnknownRelation:
+		return "Unknown relation"
 	case ErrInputSameRace:
 		return "Race name must be different from your own"
 	case ErrInputEntityTypeNameInvalid:

internal/error/input.go

@@ -3,6 +3,11 @@ package error
 func NewRaceUnknownError(arg ...any) error {
 	return newGenericError(ErrInputUnknownRace, arg...)
 }
+
+func NewUnknownRelationError(arg ...any) error {
+	return newGenericError(ErrInputUnknownRelation, arg...)
+}
+
 func NewSameRaceError(arg ...any) error {
 	return newGenericError(ErrInputSameRace, arg...)
 }