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/environments/.env.ts

@@ -5,12 +5,13 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
+
 // IMPORTANT: THIS FILE IS AUTO GENERATED! DO NOT MANUALLY EDIT OR CHECKIN!
 /* tslint:disable */
 export default {
   'mifos_x': {
-    'version': '260509',
-    'hash': 'g2d4fb4237'
+    'version': '260511',
+    'hash': 'g3b752dc6a'
   },
   'allow_switching_backend_instance': true
 };