fix: og:locale hardcoded ru_RU regardless of active locale

Both setItemMeta() and resetToDefaults() hardcoded 'ru_RU'. Added a
LanguageService-driven mapping (ru/en/hy -> ru_RU/en_US/hy_AM).

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

src/app/services/seo.service.ts

@@ -4,6 +4,13 @@ import { Item } from '../models';
 import { getDiscountedPrice, getMainImage } from '../utils/item.utils';
 import { UiRuntimeFacade } from '../facades/runtime/ui-runtime.facade';
 import { ConfigService } from '../core/config/config.service';
+import { LanguageService } from './language.service';
+
+const OG_LOCALE_MAP: Record<string, string> = {
+  ru: 'ru_RU',
+  en: 'en_US',
+  hy: 'hy_AM',
+};
 
 @Injectable({
   providedIn: 'root'
@@ -14,6 +21,7 @@ export class SeoService {
   private doc = inject(DOCUMENT);
   private readonly uiRuntime = inject(UiRuntimeFacade);
   private readonly configService = inject(ConfigService);
+  private readonly languageService = inject(LanguageService);
 
   constructor() {
     // Keep the runtime <title>/OG/Twitter/canonical/robots tags in sync with
@@ -38,6 +46,10 @@ export class SeoService {
     return this.uiRuntime.marketplaceDisplayName() || 'Marketplace';
   }
 
+  private get ogLocale(): string {
+    return OG_LOCALE_MAP[this.languageService.currentLanguage()] ?? 'en_US';
+  }
+
   /**
    * Set Open Graph & Twitter Card meta tags for a product/item page.
    */
@@ -59,7 +71,7 @@ export class SeoService {
       { property: 'og:image', content: imageUrl },
       { property: 'og:url', content: itemUrl },
       { property: 'og:site_name', content: this.siteName },
-      { property: 'og:locale', content: 'ru_RU' },
+      { property: 'og:locale', content: this.ogLocale },
 
       // Product-specific OG tags
       { property: 'product:price:amount', content: price.toFixed(2) },
@@ -111,7 +123,7 @@ export class SeoService {
       { property: 'og:image', content: defaultImage },
       { property: 'og:url', content: this.siteUrl },
       { property: 'og:site_name', content: this.siteName },
-      { property: 'og:locale', content: 'ru_RU' },
+      { property: 'og:locale', content: this.ogLocale },
 
       { name: 'twitter:card', content: 'summary_large_image' },
       { name: 'twitter:title', content: defaultTitle },