fix(storefront): create missing footer payment-icon assets

bootstrap.json's footer.paymentIcons referenced /assets/images/
mir-logo.svg, visa-logo.svg, mastercard-logo.svg - none of that
directory's files existed until the RC-02 placeholder fix, and these
three were still missing. Site-wide broken-image icons in every page
footer. Added neutral labeled-badge SVGs (not reproductions of the
actual trademarked logo artwork) at the exact referenced paths, plus
an onerror fallback on the footer <img> for defense in depth.

src/app/components/footer/footer.component.html

@@ -29,7 +29,7 @@
         <h4>{{ 'footer.payment' | translate }}</h4>
         <div class="app-footer__payments">
           @for (icon of paymentIcons(); track $index) {
-            <img [src]="icon.src" [alt]="icon.alt" loading="lazy" [width]="icon.width" [height]="icon.height" />
+            <img [src]="icon.src" [alt]="icon.alt" loading="lazy" [width]="icon.width" [height]="icon.height" (error)="onImageError($event)" />
           }
         </div>
       </div>

src/app/components/footer/footer.component.ts

@@ -6,6 +6,7 @@ import { UiRuntimeFacade } from '../../facades/runtime/ui-runtime.facade';
 import { LangRoutePipe } from '../../pipes/lang-route.pipe';
 import { FooterPaymentIcon, FooterResolvedGroup, FooterResolverService } from '../../core/config/footer-resolver.service';
 import { ConfigService } from '../../core/config/config.service';
+import { onImageError } from '../../utils/item.utils';
 
 @Component({
   selector: 'app-footer',
@@ -15,6 +16,8 @@ import { ConfigService } from '../../core/config/config.service';
   changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class FooterComponent {
+  readonly onImageError = onImageError;
+
   readonly footerGroups = signal<FooterResolvedGroup[]>([]);
   readonly paymentIcons = signal<FooterPaymentIcon[]>([]);
   readonly copyrightText = signal('');