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-routing.module.ts

@@ -60,6 +60,7 @@ import { ClientCollateralResolver } from './common-resolvers/client-collateral.r
 import { KycTabComponent } from './clients-view/kyc-tab/kyc-tab.component';
 import { CkycTabComponent } from './clients-view/ckyc-tab/ckyc-tab.component';
 import { Form60TabComponent } from './clients-view/form60-tab/form60-tab.component';
+import { Form121TabComponent } from './clients-view/form121-tab/form121-tab.component';
 import { EntityClassificationTabComponent } from './clients-view/entity-classification-tab/entity-classification-tab.component';
 import { familyAllowedGuard, nomineeAllowedGuard } from './utils/family-nominee.guard';
 
@@ -193,6 +194,11 @@ const routes: Routes = [
               component: Form60TabComponent,
               data: { title: 'Form 97', breadcrumb: 'Form 97', routeParamBreadcrumb: false }
             },
+            {
+              path: 'form121',
+              component: Form121TabComponent,
+              data: { title: 'Form 121 / TDS', breadcrumb: 'Form 121 / TDS', routeParamBreadcrumb: false }
+            },
             {
               path: 'documents',
               component: DocumentsTabComponent,