정합성 위반사항 확인 및 조치기능 추가

backend/internal/domain/data_integrity.go

@@ -39,3 +39,22 @@ type DataIntegrityCheck struct {
 	Severity    string              `json:"severity"`
 	Count       int64               `json:"count"`
 }
+
+type OrphanUserLoginID struct {
+	ID              string     `json:"id"`
+	UserID          string     `json:"userId"`
+	UserEmail       string     `json:"userEmail,omitempty"`
+	UserDeletedAt   *time.Time `json:"userDeletedAt,omitempty"`
+	TenantID        string     `json:"tenantId"`
+	TenantSlug      string     `json:"tenantSlug,omitempty"`
+	TenantDeletedAt *time.Time `json:"tenantDeletedAt,omitempty"`
+	FieldKey        string     `json:"fieldKey"`
+	LoginID         string     `json:"loginId"`
+	Reasons         []string   `json:"reasons"`
+}
+
+type DeleteOrphanUserLoginIDsResult struct {
+	DeletedCount int64               `json:"deletedCount"`
+	Deleted      []OrphanUserLoginID `json:"deleted"`
+	SkippedIDs   []string            `json:"skippedIds"`
+}