feat: add hero section and service cards to the hub page

CVE Watch card resolves its href per-locale (cve-en/cve-fr), Convert
resolves to the same URL on both locales.

tests/services.test.ts

@@ -0,0 +1,33 @@
+import { describe, it, expect, beforeAll } from 'vitest';
+import { execSync } from 'node:child_process';
+import { readFileSync } from 'node:fs';
+
+describe('hero and service cards', () => {
+  let en: string;
+  let fr: string;
+
+  beforeAll(() => {
+    execSync('npm run build', { stdio: 'inherit' });
+    en = readFileSync('dist/en/index.html', 'utf-8');
+    fr = readFileSync('dist/fr/index.html', 'utf-8');
+  });
+
+  it('renders the localized hero copy', () => {
+    expect(en).toContain('The Ombrora hub');
+    expect(fr).toContain('Le hub des outils Ombrora');
+  });
+
+  it('renders the CVE Watch card with a locale-specific link', () => {
+    expect(en).toContain('href="https://cve-en.ombrora.com"');
+    expect(fr).toContain('href="https://cve-fr.ombrora.com"');
+    expect(en).toContain('CVE Watch');
+    expect(fr).toContain('Veille CVE');
+  });
+
+  it('renders the Convert card with the same link on both locales', () => {
+    const enMatches = en.match(/href="https:\/\/convert\.ombrora\.com"/g) ?? [];
+    const frMatches = fr.match(/href="https:\/\/convert\.ombrora\.com"/g) ?? [];
+    expect(enMatches.length).toBeGreaterThan(0);
+    expect(frMatches.length).toBeGreaterThan(0);
+  });
+});