핸들러 및 서비스 테스트 리팩토링

backend/internal/domain/models.go

@@ -32,3 +32,13 @@ type AuditCursor struct {
 	Timestamp time.Time
 	EventID   string
 }
+
+// RedisRepository defines interface for KV storage (Redis)
+type RedisRepository interface {
+	Set(key string, value string, expiration time.Duration) error
+	Get(key string) (string, error)
+	Delete(key string) error
+	StoreVerificationCode(phone, code string) error
+	GetVerificationCode(phone string) (string, error)
+	DeleteVerificationCode(phone string) error
+}