feat: client-side currency conversion with admin-configurable rates

- CurrencyRatesService: RUB-based rates, persisted via localStorage
- CurrencyConvertPipe: impure pipe converting item price to selected currency
- Admin settings page: editable currency rates form
- Applied conversion to product-card, product-information, quick-view-dialog,
  delivery-information, compare-table, cart totals + payment payload

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/features/website/product/components/delivery-information/delivery-information.component.html

@@ -16,7 +16,7 @@
                 <span>{{ 'cart.deliveryTime' | translate }}: {{ option.deliveryTime }}</span>
               }
             </div>
-            <strong>{{ option.deliveryPrice | number:'1.2-2' }} {{ currency }}</strong>
+            <strong>{{ option.deliveryPrice | currencyConvert:currency | number:'1.2-2' }} {{ displayCurrency() }}</strong>
           </div>
         }
       </div>

src/app/features/website/product/components/delivery-information/delivery-information.component.ts

@@ -1,17 +1,22 @@
 import { DecimalPipe } from '@angular/common';
-import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
+import { ChangeDetectionStrategy, Component, Input, inject } from '@angular/core';
 import { Product } from '../../../../../core/products/models/product-domain.model';
 import { TranslatePipe } from '../../../../../i18n/translate.pipe';
+import { CurrencyConvertPipe } from '../../../../../pipes/currency-convert.pipe';
+import { LanguageService } from '../../../../../services/language.service';
 
 @Component({
   selector: 'app-product-delivery-information',
   standalone: true,
-  imports: [DecimalPipe, TranslatePipe],
+  imports: [DecimalPipe, TranslatePipe, CurrencyConvertPipe],
   templateUrl: './delivery-information.component.html',
   styleUrls: ['./delivery-information.component.scss'],
   changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class ProductDeliveryInformationComponent {
+  private readonly languageService = inject(LanguageService);
+  readonly displayCurrency = this.languageService.currentCurrency;
+
   @Input({ required: true }) product!: Product;
   @Input() currency = '';
 

src/app/features/website/product/components/product-information/product-information.component.html

@@ -19,12 +19,12 @@
   <div class="product-price">
     @if (product.discount > 0) {
       <div class="price-row">
-        <span class="old-price">{{ price | number:'1.2-2' }} {{ currency }}</span>
+        <span class="old-price">{{ price | currencyConvert:currency | number:'1.2-2' }} {{ displayCurrency() }}</span>
         <span class="discount-badge">-{{ product.discount }}%</span>
       </div>
-      <strong>{{ discountedPrice | number:'1.2-2' }} {{ currency }}</strong>
+      <strong>{{ discountedPrice | currencyConvert:currency | number:'1.2-2' }} {{ displayCurrency() }}</strong>
     } @else {
-      <strong>{{ price | number:'1.2-2' }} {{ currency }}</strong>
+      <strong>{{ price | currencyConvert:currency | number:'1.2-2' }} {{ displayCurrency() }}</strong>
     }
   </div>
 

src/app/features/website/product/components/product-information/product-information.component.ts

@@ -1,18 +1,23 @@
 import { DecimalPipe } from '@angular/common';
-import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from '@angular/core';
+import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output, inject } from '@angular/core';
 import { Product } from '../../../../../core/products/models/product-domain.model';
 import { TranslatePipe } from '../../../../../i18n/translate.pipe';
+import { CurrencyConvertPipe } from '../../../../../pipes/currency-convert.pipe';
+import { LanguageService } from '../../../../../services/language.service';
 import { getBadgeClass } from '../../../../../utils/item.utils';
 
 @Component({
   selector: 'app-product-information',
   standalone: true,
-  imports: [DecimalPipe, TranslatePipe],
+  imports: [DecimalPipe, TranslatePipe, CurrencyConvertPipe],
   templateUrl: './product-information.component.html',
   styleUrls: ['./product-information.component.scss'],
   changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class ProductInformationComponent {
+  private readonly languageService = inject(LanguageService);
+  readonly displayCurrency = this.languageService.currentCurrency;
+
   @Input({ required: true }) product!: Product;
   @Input() title = '';
   @Input() price = 0;

src/app/features/website/product/components/quick-view-dialog/quick-view-dialog.component.html

@@ -13,10 +13,10 @@
         <h3 class="quick-view__title">{{ product.name }}</h3>
         <p class="quick-view__price">
           @if (hasDiscount) {
-            <span class="quick-view__price-original">{{ product.price | number:'1.2-2' }} {{ product.currency }}</span>
-            <span class="quick-view__price-final">{{ discountedPrice | number:'1.2-2' }} {{ product.currency }}</span>
+            <span class="quick-view__price-original">{{ product.price | currencyConvert:product.currency | number:'1.2-2' }} {{ displayCurrency() }}</span>
+            <span class="quick-view__price-final">{{ discountedPrice | currencyConvert:product.currency | number:'1.2-2' }} {{ displayCurrency() }}</span>
           } @else {
-            <span class="quick-view__price-final">{{ product.price | number:'1.2-2' }} {{ product.currency }}</span>
+            <span class="quick-view__price-final">{{ product.price | currencyConvert:product.currency | number:'1.2-2' }} {{ displayCurrency() }}</span>
           }
         </p>
         @if (product.simpleDescription) {

src/app/features/website/product/components/quick-view-dialog/quick-view-dialog.component.ts

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from '@angular/core';
+import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output, inject } from '@angular/core';
 import { DecimalPipe } from '@angular/common';
 import { RouterLink } from '@angular/router';
 import { Product } from '../../../../../core/products/models/product-domain.model';
@@ -6,17 +6,22 @@ import { DialogComponent } from '../../../../../shared/ui/dialog/dialog.componen
 import { ButtonComponent } from '../../../../../shared/ui/button/button.component';
 import { TranslatePipe } from '../../../../../i18n/translate.pipe';
 import { LangRoutePipe } from '../../../../../pipes/lang-route.pipe';
+import { CurrencyConvertPipe } from '../../../../../pipes/currency-convert.pipe';
+import { LanguageService } from '../../../../../services/language.service';
 import { getDiscountedPrice, getMainImage } from '../../../../../utils/item.utils';
 
 @Component({
   selector: 'app-quick-view-dialog',
   standalone: true,
-  imports: [DialogComponent, ButtonComponent, TranslatePipe, LangRoutePipe, DecimalPipe, RouterLink],
+  imports: [DialogComponent, ButtonComponent, TranslatePipe, LangRoutePipe, DecimalPipe, RouterLink, CurrencyConvertPipe],
   templateUrl: './quick-view-dialog.component.html',
   styleUrl: './quick-view-dialog.component.scss',
   changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class QuickViewDialogComponent {
+  private readonly languageService = inject(LanguageService);
+  readonly displayCurrency = this.languageService.currentCurrency;
+
   @Input() product: Product | null = null;
   @Input() loading = false;