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

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

src/app/core/content/shell-copy.ts

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+import { type AppLocale } from '../i18n/locale';
+
+export interface ShellCopy {
+  readonly skipLink: string;
+  readonly primaryNavLabel: string;
+  readonly footerNavLabel: string;
+  readonly menuOpen: string;
+  readonly menuClose: string;
+  readonly languageSwitch: string;
+  readonly otherLocaleName: string;
+  readonly cvLabel: string;
+  readonly contactCta: string;
+  readonly scaffoldingNote: string;
+  readonly legalReviewNotice: string;
+  readonly notFoundHomeLabel: string;
+}
+
+export const SHELL_COPY: Record<AppLocale, ShellCopy> = {
+  de: {
+    skipLink: 'Zum Inhalt springen',
+    primaryNavLabel: 'Hauptnavigation',
+    footerNavLabel: 'Fußzeilen-Navigation',
+    menuOpen: 'Menü öffnen',
+    menuClose: 'Menü schließen',
+    languageSwitch: 'Zur englischen Version wechseln',
+    otherLocaleName: 'English',
+    cvLabel: 'Lebenslauf als PDF',
+    contactCta: 'Kontakt',
+    scaffoldingNote: 'Hinweis: Der endgültige Inhalt folgt. Diese Seite ist ein Gerüst.',
+    legalReviewNotice:
+      'Platzhalter: Dieser Rechtstext ist ungeprüft und muss vor der Veröffentlichung vom Seitenbetreiber geprüft werden.',
+    notFoundHomeLabel: 'Zur Startseite',
+  },
+  en: {
+    skipLink: 'Skip to content',
+    primaryNavLabel: 'Primary navigation',
+    footerNavLabel: 'Footer navigation',
+    menuOpen: 'Open menu',
+    menuClose: 'Close menu',
+    languageSwitch: 'Switch to the German version',
+    otherLocaleName: 'Deutsch',
+    cvLabel: 'Curriculum vitae as PDF',
+    contactCta: 'Contact',
+    scaffoldingNote: 'Note: Final content follows. This page is scaffolding.',
+    legalReviewNotice:
+      'Placeholder: This legal text is unreviewed and must be checked by the site owner before publication.',
+    notFoundHomeLabel: 'Back to home',
+  },
+};