Add API link in nav bar pointing to Swagger UI

Opens /api/v1/swagger-ui in a new tab for manual endpoint testing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/layout/TopNav.tsx

@@ -28,6 +28,11 @@ export function TopNav() {
             Applications
           </NavLink>
         </li>
+        <li>
+          <a href="/api/v1/swagger-ui/index.html" target="_blank" rel="noopener noreferrer" className={styles.navLink}>
+            API
+          </a>
+        </li>
         {roles.includes('ADMIN') && (
           <li>
             <NavLink to="/admin/oidc" className={({ isActive }) => isActive ? styles.navLinkActive : styles.navLink}>