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

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

src/app/core/navigation/navigation.ts

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+import { type AppLocale } from '../i18n/locale';
+import { type RouteId } from '../routing/route-ids';
+
+export interface NavItem {
+  readonly routeId: RouteId;
+  readonly label: Record<AppLocale, string>;
+  readonly children?: readonly NavItem[];
+}
+
+export const PRIMARY_NAV: readonly NavItem[] = [
+  {
+    routeId: 'home',
+    label: { de: 'Start', en: 'Home' },
+  },
+  {
+    routeId: 'services',
+    label: { de: 'Leistungen', en: 'Services' },
+    children: [
+      {
+        routeId: 'servicesSoftware',
+        label: { de: 'Software', en: 'Software' },
+      },
+      {
+        routeId: 'servicesHardwareNetwork',
+        label: { de: 'Hardware und Netzwerk', en: 'Hardware and network' },
+      },
+      {
+        routeId: 'servicesClusters',
+        label: { de: 'Cluster', en: 'Clusters' },
+      },
+      {
+        routeId: 'servicesAi',
+        label: { de: 'KI-Integration', en: 'AI integration' },
+      },
+    ],
+  },
+  {
+    routeId: 'projects',
+    label: { de: 'Projekte', en: 'Projects' },
+  },
+  {
+    routeId: 'stack',
+    label: { de: 'Stack', en: 'Stack' },
+  },
+  {
+    routeId: 'about',
+    label: { de: 'Über mich', en: 'About' },
+  },
+  {
+    routeId: 'contact',
+    label: { de: 'Kontakt', en: 'Contact' },
+  },
+];
+
+export const FOOTER_NAV: readonly NavItem[] = [
+  {
+    routeId: 'imprint',
+    label: { de: 'Impressum', en: 'Legal notice' },
+  },
+  {
+    routeId: 'privacy',
+    label: { de: 'Datenschutz', en: 'Privacy' },
+  },
+  {
+    routeId: 'contact',
+    label: { de: 'Kontakt', en: 'Contact' },
+  },
+];