feat: MFA/2FA, OTP audit logs, KYC + client/user enhancements

- Access Control module: SMS/Email/TOTP/Hardware-token MFA factor management
- OTP Audit Logs module under Admin menu (list + detail) with 401/403 handling
- Two-factor authentication login flow updates
- Client KYC, India address, family-members, ckyc, nominee enhancements
- New shared KYC helpers (kyc-proof-types, kyc-upload-helper.service)
- User create/edit/view enhancements
- Shell navigation: OTP Audit Logs entry under real Admin menu

src/main.scss

@@ -1041,3 +1041,29 @@ mat-card {
     margin: 0 !important;
   }
 }
+
+/* ===================== Two-factor authentication dialog ===================== */
+.tfa-dialog-panel {
+  .mat-mdc-dialog-surface {
+    background: linear-gradient(160deg, #0b1220 0%, #0f172a 60%, #111c33 100%) !important;
+    border-radius: 18px !important;
+    padding: 0 !important;
+    box-shadow: 0 30px 80px rgb(0 0 0 / 55%) !important;
+    overflow: hidden;
+  }
+
+  .mat-mdc-dialog-container {
+    --mdc-dialog-container-color: transparent;
+
+    padding: 0 !important;
+  }
+}
+
+.cdk-overlay-pane.tfa-dialog-panel {
+  border-radius: 18px;
+}
+
+.tfa-dialog-backdrop {
+  background: rgb(2 6 23 / 75%) !important;
+  backdrop-filter: blur(4px);
+}