fix: restore content silently dropped from the dev merge (KYC exception, TDS reports, Form 121)

The demo-backup merge's git 3-way auto-resolve dropped several hunks
without flagging conflicts, wherever demo had independently touched
adjacent lines: the KYC Exception feature (client-kyc-step, kyc-tab,
create-client, clients.service — checkbox, derivation logic, banners,
contact-log endpoints), TDS report routes/menu links (reports-routing,
shell), the Form 121 client tab (clients-routing, clients-view), the
kyc-management exceptions dashboard, and the Form 121/15G-H register's
real-data view integration. Restored by diffing demo-backup against
dev per file and re-applying each genuine gap while preserving
demo-backup's own independent work (Approval Center tab style, Loan
Origination/Investment menus, form-97-98/risk-review report routes).

src/app/clients/clients-view/clients-view.component.html

@@ -545,6 +545,15 @@
       >
         <i class="fa fa-file-text cv-tab-icon"></i> {{ 'labels.inputs.Form 60' | translate }}
       </a>
+      <a
+        mat-tab-link
+        [routerLink]="['./form121']"
+        routerLinkActive
+        #form121="routerLinkActive"
+        [active]="form121.isActive"
+      >
+        <i class="fa fa-percent cv-tab-icon"></i> Form 121 / TDS
+      </a>
       <a
         mat-tab-link
         [routerLink]="['./documents']"