feat: add yggdrasil metadata endpoint and support authlib-injector

internal/core/profile_service.go

@@ -158,3 +158,19 @@ func (s *ProfileService) UpdateUserSkin(ctx context.Context, userID int, file mu
 
 	return s.UserRepo.UpdateSkinHash(ctx, userID, hash)
 }
+
+// GetPublicKey возвращает публичный ключ в формате PEM
+func (s *ProfileService) GetPublicKey() (string, error) {
+	pubKey := &s.privateKey.PublicKey
+	pubASN1, err := x509.MarshalPKIXPublicKey(pubKey)
+	if err != nil {
+		return "", err
+	}
+
+	pubBytes := pem.EncodeToMemory(&pem.Block{
+		Type:  "PUBLIC KEY",
+		Bytes: pubASN1,
+	})
+
+	return string(pubBytes), nil
+}