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/page.tsx

@@ -1,10 +1,11 @@
-import React from "react";
+"use client";
+
+import React, { useEffect, useState } from "react";
 import Link from "next/link";
 import HeroComposition from "./_components/HeroComposition";
 import { ProjectPageView } from "./_components/ProjectPageView";
 import { getStatsSummary, getResearchAreaNames, getResearchProjects } from "../lib/api";
-
-export const dynamic = "force-dynamic";
+import type { ResearchProject } from "../content/types";
 
 const INTERNATIONAL_SDOS = [
   "IEC TC100: Multimedia Systems and Equipment",
@@ -14,15 +15,26 @@ const INTERNATIONAL_SDOS = [
   "ISO/IEC JTC1/SC6: Reliable Multicasting",
 ];
 
-export default async function HomePage() {
-  const stats = (await getStatsSummary()) ?? {
+export default function HomePage() {
+  const [stats, setStats] = useState({
     intlPubsCount: 0,
     patentCount: 0,
     stdDocsCount: 0,
-  };
+  });
+  const [researchAreas, setResearchAreas] = useState<string[]>([]);
+  const [researchProjects, setResearchProjects] = useState<ResearchProject[]>([]);
 
-  const researchAreas = (await getResearchAreaNames()) ?? [];
-  const researchProjects = (await getResearchProjects()) ?? [];
+  useEffect(() => {
+    getStatsSummary().then((s) => {
+      if (s) setStats(s);
+    });
+    getResearchAreaNames().then((areas) => {
+      if (areas) setResearchAreas(areas);
+    });
+    getResearchProjects().then((projs) => {
+      if (projs) setResearchProjects(projs);
+    });
+  }, []);
 
   return (
     <div className="container-content space-y-16 md:space-y-24 pt-10 md:pt-16 pb-16 md:pb-24">