feat: user service

user/internal/ports/race_name_policy.go

@@ -0,0 +1,14 @@
+package ports
+
+import (
+	"galaxy/user/internal/domain/account"
+	"galaxy/user/internal/domain/common"
+)
+
+// RaceNamePolicy produces the canonical uniqueness key used to reserve one
+// replaceable race-name slot.
+type RaceNamePolicy interface {
+	// CanonicalKey returns the stable reservation key for raceName. Callers are
+	// expected to pass a validated raceName value.
+	CanonicalKey(raceName common.RaceName) (account.RaceNameCanonicalKey, error)
+}