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

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

src/app/core/i18n/locale.resolver.ts

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+import { inject } from '@angular/core';
+import { type ResolveFn } from '@angular/router';
+import { DEFAULT_LOCALE, isAppLocale, type AppLocale } from './locale';
+import { LocaleService } from './locale.service';
+
+export const localeResolver: ResolveFn<AppLocale> = (route) => {
+  const localeValue: unknown = route.data['locale'];
+  const locale = isAppLocale(localeValue) ? localeValue : DEFAULT_LOCALE;
+  inject(LocaleService).setLocale(locale);
+  return locale;
+};