feat(arch): unify frontend and backend into single Go backend server with static export

- Configure Next.js static export (output: 'export') with client-side dynamic fetching
- Implement Go static serving with SPA fallback in backend/internal/router/router.go
- Unify multi-stage build in backend/Dockerfile (Node -> Go -> minimal Alpine runtime)
- Simplify root docker-compose.yml to single anl-app service on port 8080
- Update REQUIREMENTS.md DM-03 and AC-17 normative contracts to v3.0 Unified Go Backend
- Restore strict regression verification in Gate 9 (AC-35/36/37) and unittest suite
- All Go unit tests, TypeScript type checks, ESLint, and E2E gates passed clean

refer_landing_page/app/members/layout.tsx

@@ -0,0 +1,10 @@
+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Members",
+  description: "AI Agent Networking Lab (ANL) professor, active researchers, and alumni directory",
+};
+
+export default function MembersLayout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}