refactor: backend tenant_group 제거 및 리팩터 반영

backend/internal/bootstrap/bootstrap.go

@@ -31,7 +31,6 @@ func migrateSchemas(db *gorm.DB) error {
 	slog.Info("[Bootstrap] Migrating database schemas...")
 	// Add all domain models here
 	return db.AutoMigrate(
-		&domain.TenantGroup{},
 		&domain.Tenant{},
 		&domain.TenantDomain{},
 		&domain.User{},

backend/internal/bootstrap/keto_sync.go

@@ -25,18 +25,6 @@ func SyncKetoRelations(db *gorm.DB, keto service.KetoService) error {
 		if t.ParentID != nil {
 			_ = keto.CreateRelation(ctx, "Tenant", t.ID, "parent", *t.ParentID)
 		}
-		if t.TenantGroupID != nil {
-			_ = keto.CreateRelation(ctx, "Tenant", t.ID, "parent_group", *t.TenantGroupID)
-		}
-	}
-
-	// 1.1 Sync Tenant Groups (Group Admins)
-	var groups []domain.TenantGroup
-	if err := db.Find(&groups).Error; err == nil {
-		slog.Info("Syncing tenant groups to Keto", "count", len(groups))
-		for range groups {
-			// 그룹 관리자 개념 확정 후 관계 생성 로직 추가 예정
-		}
 	}
 
 	// 2. Sync All Users

backend/internal/bootstrap/kratos_seed.go

@@ -34,7 +34,6 @@ func SeedAdminIdentity(idp domain.IdentityProvider) error {
 			"affiliationType": "internal",
 			"companyCode":     "",
 			"grade":           "admin",
-			"role":            domain.RoleSuperAdmin,
 		},
 	}