foundation: project guide, tooling, design tokens, bilingual shell and routing contracts

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/core/content/content.service.ts

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+import { computed, inject, Injectable, type Signal } from '@angular/core';
+import { LocaleService } from '../i18n/locale.service';
+import { type RouteId } from '../routing/route-ids';
+import { type PageCopy } from './content.contracts';
+import { SITE_CONTENT } from './content.token';
+
+@Injectable({ providedIn: 'root' })
+export class ContentService {
+  private readonly localeService = inject(LocaleService);
+  private readonly content = inject(SITE_CONTENT);
+
+  page(routeId: RouteId): Signal<PageCopy | undefined> {
+    return computed(() => this.content[this.localeService.locale()].pages[routeId]);
+  }
+}