Add embedded Swagger UI page with auto-injected JWT auth

- New /swagger route with lazy-loaded SwaggerPage that initializes
  swagger-ui-dist and injects the session JWT via requestInterceptor
- Move API link from primary nav to navRight utility area (pill style)
- Code-split swagger chunk (~1.4 MB) so main bundle stays lean

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

ui/src/components/layout/TopNav.module.css

@@ -61,6 +61,30 @@
   gap: 16px;
 }
 
+.utilLink {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  font-weight: 500;
+  color: var(--text-muted);
+  text-decoration: none;
+  padding: 4px 10px;
+  border-radius: 99px;
+  border: 1px solid var(--border);
+  transition: all 0.15s;
+}
+
+.utilLink:hover {
+  color: var(--text-primary);
+  border-color: var(--text-muted);
+}
+
+.utilLinkActive {
+  composes: utilLink;
+  color: var(--amber);
+  border-color: rgba(245, 158, 11, 0.3);
+  background: var(--amber-glow);
+}
+
 .envBadge {
   font-family: var(--font-mono);
   font-size: 11px;

ui/src/components/layout/TopNav.tsx

@@ -28,11 +28,6 @@ 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}>
@@ -43,6 +38,9 @@ export function TopNav() {
       </ul>
 
       <div className={styles.navRight}>
+        <NavLink to="/swagger" className={({ isActive }) => isActive ? styles.utilLinkActive : styles.utilLink} title="API Documentation">
+          API
+        </NavLink>
         <span className={styles.envBadge}>{import.meta.env.VITE_ENV_NAME || 'DEV'}</span>
         <button className={styles.themeToggle} onClick={toggle} title="Toggle theme">
           {theme === 'dark' ? '\u2600\uFE0F' : '\uD83C\uDF19'}