Add React UI with Execution Explorer, auth, and standalone deployment

- Scaffold Vite + React + TypeScript frontend in ui/ with full design
  system (dark/light themes) matching the HTML mockups
- Implement Execution Explorer page: search filters, results table with
  expandable processor tree and exchange detail sidebar, pagination
- Add UI authentication: UiAuthController (login/refresh endpoints),
  JWT filter handles ui: subject prefix, CORS configuration
- Shared components: StatusPill, DurationBar, StatCard, AppBadge,
  FilterChip, Pagination — all using CSS Modules with design tokens
- API client layer: openapi-fetch with auth middleware, TanStack Query
  hooks for search/detail/snapshot queries, Zustand for state
- Standalone deployment: Nginx Dockerfile, K8s Deployment + ConfigMap +
  NodePort (30080), runtime config.js for API base URL
- Embedded mode: maven-resources-plugin copies ui/dist into JAR static
  resources, SPA forward controller for client-side routing
- CI/CD: UI build step, Docker build/push for server-ui image, K8s
  deploy step for UI, UI credential secrets

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

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+.main {
+  position: relative;
+  z-index: 1;
+  max-width: 1440px;
+  margin: 0 auto;
+  padding: 24px;
+}

ui/src/components/layout/AppShell.tsx

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+import { Outlet } from 'react-router';
+import { TopNav } from './TopNav';
+import styles from './AppShell.module.css';
+
+export function AppShell() {
+  return (
+    <>
+      <TopNav />
+      <main className={styles.main}>
+        <Outlet />
+      </main>
+    </>
+  );
+}

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

@@ -0,0 +1,114 @@
+.topnav {
+  position: sticky;
+  top: 0;
+  z-index: 100;
+  background: var(--topnav-bg);
+  backdrop-filter: blur(20px) saturate(1.2);
+  border-bottom: 1px solid var(--border-subtle);
+  padding: 0 24px;
+  display: flex;
+  align-items: center;
+  height: 56px;
+  gap: 32px;
+}
+
+.logo {
+  font-family: var(--font-mono);
+  font-weight: 600;
+  font-size: 16px;
+  color: var(--amber);
+  letter-spacing: -0.5px;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  flex-shrink: 0;
+  text-decoration: none;
+}
+
+.logo:hover { color: var(--amber); }
+
+.navLinks {
+  display: flex;
+  gap: 4px;
+  list-style: none;
+}
+
+.navLink {
+  padding: 8px 16px;
+  border-radius: var(--radius-sm);
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--text-secondary);
+  transition: all 0.15s;
+  text-decoration: none;
+}
+
+.navLink:hover {
+  color: var(--text-primary);
+  background: var(--bg-raised);
+}
+
+.navLinkActive {
+  composes: navLink;
+  color: var(--amber);
+  background: var(--amber-glow);
+}
+
+.navRight {
+  margin-left: auto;
+  display: flex;
+  align-items: center;
+  gap: 16px;
+}
+
+.envBadge {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  padding: 4px 10px;
+  border-radius: 99px;
+  background: var(--green-glow);
+  color: var(--green);
+  border: 1px solid rgba(16, 185, 129, 0.2);
+  font-weight: 500;
+}
+
+.themeToggle {
+  background: none;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  padding: 6px 8px;
+  cursor: pointer;
+  color: var(--text-muted);
+  font-size: 16px;
+  display: flex;
+  align-items: center;
+  transition: all 0.15s;
+}
+
+.themeToggle:hover {
+  border-color: var(--text-muted);
+  color: var(--text-primary);
+}
+
+.userInfo {
+  font-size: 12px;
+  color: var(--text-muted);
+  font-family: var(--font-mono);
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.logoutBtn {
+  background: none;
+  border: none;
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 12px;
+  padding: 4px;
+  transition: color 0.15s;
+}
+
+.logoutBtn:hover {
+  color: var(--rose);
+}

ui/src/components/layout/TopNav.tsx

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+import { NavLink } from 'react-router';
+import { useThemeStore } from '../../theme/theme-store';
+import { useAuthStore } from '../../auth/auth-store';
+import styles from './TopNav.module.css';
+
+export function TopNav() {
+  const { theme, toggle } = useThemeStore();
+  const { username, logout } = useAuthStore();
+
+  return (
+    <nav className={styles.topnav}>
+      <NavLink to="/" className={styles.logo}>
+        <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+          <path d="M12 2C6.5 2 2 6.5 2 12s4.5 10 10 10 10-4.5 10-10S17.5 2 12 2" />
+          <path d="M12 6v6l4 2" />
+        </svg>
+        cameleer3
+      </NavLink>
+
+      <ul className={styles.navLinks}>
+        <li>
+          <NavLink to="/executions" className={({ isActive }) => isActive ? styles.navLinkActive : styles.navLink}>
+            Transactions
+          </NavLink>
+        </li>
+      </ul>
+
+      <div className={styles.navRight}>
+        <span className={styles.envBadge}>PRODUCTION</span>
+        <button className={styles.themeToggle} onClick={toggle} title="Toggle theme">
+          {theme === 'dark' ? '\u2600\uFE0F' : '\uD83C\uDF19'}
+        </button>
+        {username && (
+          <span className={styles.userInfo}>
+            {username}
+            <button className={styles.logoutBtn} onClick={logout} title="Sign out">
+              &#x2715;
+            </button>
+          </span>
+        )}
+      </div>
+    </nav>
+  );
+}