feat: DSC enrollment + MFA controls, user CRUD UX, auth error hardening

- DSC module: list/enroll/revoke dialogs and dsc.service (m_bank_user_dsc API)
- Access control: DSC + MFA toggles via disable-confirm-dialog
- Two-factor auth: expanded UX (DSC + OTP flows)
- Users: create/edit form polish, success snackbar on edit, DSC widget
  retained only inside dsc/ (removed from view-user)
- Auth: X-Requested-With added globally; error handler null-safe on
  empty 500 bodies

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/users/users.module.ts

@@ -19,6 +19,11 @@ import { CreateUserComponent } from './create-user/create-user.component';
 import { ViewUserComponent } from './view-user/view-user.component';
 import { EditUserComponent } from './edit-user/edit-user.component';
 
+/** DSC Components */
+import { DscListComponent } from './dsc/dsc-list/dsc-list.component';
+import { EnrollDscDialogComponent } from './dsc/enroll-dsc-dialog/enroll-dsc-dialog.component';
+import { RevokeDscDialogComponent } from './dsc/revoke-dsc-dialog/revoke-dsc-dialog.component';
+
 /** Custom Components of Zitadel */
 import { ViewUserComponent as ViewUserZitadelComponent } from '../zitadel/users/view-user/view-user.component';
 import { EditUserComponent as EditUserZitadelComponent } from '../zitadel/users/edit-user/edit-user.component';
@@ -38,6 +43,9 @@ import { UsersComponent as UserZitadelComponent } from '../zitadel/users/users.c
     CreateUserComponent,
     ViewUserComponent,
     EditUserComponent,
+    DscListComponent,
+    EnrollDscDialogComponent,
+    RevokeDscDialogComponent,
     // Users Zitadel
     UserZitadelComponent,
     ViewUserZitadelComponent,