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/standardization/page.tsx

@@ -1,16 +1,17 @@
-import React from "react";
-import type { Metadata } from "next";
+"use client";
+
+import React, { useEffect, useState } from "react";
 import { getStandardsBodies } from "../../lib/api";
+import type { StandardsBody } from "../../content/types";
 
-export const metadata: Metadata = {
-  title: "Standardization",
-  description: "AI Agent Networking Lab (ANL) international standardization research and contributions",
-};
+export default function StandardizationPage() {
+  const [standardsBodies, setStandardsBodies] = useState<StandardsBody[]>([]);
 
-export const dynamic = "force-dynamic";
-
-export default async function StandardizationPage() {
-  const standardsBodies = (await getStandardsBodies()) ?? [];
+  useEffect(() => {
+    getStandardsBodies().then((sb) => {
+      if (sb) setStandardsBodies(sb);
+    });
+  }, []);
   return (
     <div className="container-content py-8 sm:py-12 space-y-10 sm:space-y-14">
       {/* Page Header */}