feat(work): /work 허브 신설 — Custom Build 4 카드 + 5건 사례 + 견적 폼

- 4 카드: 외주 / 웹사이트 / AI 사주 / 블로그 (자동화는 외주 흡수)
- 납품 사례: lib/freelance-portfolio 5건 import
- 견적 CTA: ContactModal('외주 개발 문의')
- 가격 표 없음 — 가격 미정 (P3에서 추가 예정)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/work/page.tsx

@@ -0,0 +1,140 @@
+'use client';
+
+import { useState } from 'react';
+import Link from 'next/link';
+import ContactModal from '@/app/components/ContactModal';
+import { PORTFOLIO } from '@/lib/freelance-portfolio';
+import { trackCTAClick } from '@/lib/gtag';
+
+const CARDS = [
+  {
+    href: '/work/freelance',
+    label: '외주 개발',
+    desc: '맞춤 솔루션 외주 · RPA·API 연동·자동화 포함',
+    key: 'freelance',
+  },
+  {
+    href: '/work/website',
+    label: '웹사이트 제작',
+    desc: '기업·브랜드 사이트 · Next.js + SEO + 배포',
+    key: 'website',
+  },
+  {
+    href: '/work/saju',
+    label: 'AI 사주',
+    desc: 'AI 사주팔자 + 12개 항목 해석 (무료)',
+    key: 'saju',
+  },
+  {
+    href: '/work/blog',
+    label: '블로그 자동화',
+    desc: '수익 엔진 팩 · 자동화 마케팅 콘텐츠',
+    key: 'blog',
+  },
+];
+
+export default function WorkHub() {
+  const [modalOpen, setModalOpen] = useState(false);
+  const [modalService, setModalService] = useState('외주 개발 문의');
+
+  const openContact = (service: string) => {
+    setModalService(service);
+    setModalOpen(true);
+  };
+
+  return (
+    <div className="min-h-screen bg-black text-white">
+      <ContactModal
+        isOpen={modalOpen}
+        onClose={() => {
+          setModalOpen(false);
+          setModalService('외주 개발 문의');
+        }}
+        service={modalService}
+        checklist={['연락처/이메일', '원하는 작업 범위', '희망 일정']}
+      />
+
+      <section className="relative w-full min-h-[60vh] flex items-center justify-center px-6 border-b border-white/10">
+        <div className="absolute inset-0 bg-gradient-to-b from-[#060e20] to-black pointer-events-none" />
+        <div className="relative z-10 max-w-3xl mx-auto text-center">
+          <p className="font-mono text-[11px] tracking-widest uppercase text-white/50 mb-4">
+            Custom Build
+          </p>
+          <h1
+            className="kx-display text-4xl md:text-6xl font-bold mb-5"
+            style={{ wordBreak: 'keep-all', letterSpacing: '-0.02em' }}
+          >
+            맞춤 개발 사업부
+          </h1>
+          <p className="text-base md:text-lg text-white/70 max-w-2xl mx-auto leading-relaxed">
+            7년차 백엔드 개발자가 직접 설계·개발·납품. 외주, 웹사이트, AI 사주, 블로그 자동화까지.
+          </p>
+        </div>
+      </section>
+
+      <section className="py-20 px-6">
+        <div className="max-w-6xl mx-auto grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
+          {CARDS.map((c) => (
+            <Link
+              key={c.key}
+              href={c.href}
+              onClick={() => trackCTAClick(`work_hub_card_${c.key}`)}
+              className="group rounded-2xl border border-white/15 bg-white/[0.02] p-5 hover:border-white/40 hover:bg-white/[0.05] transition flex flex-col"
+              style={{ textDecoration: 'none' }}
+            >
+              <p className="font-bold text-white text-sm mb-1.5">{c.label}</p>
+              <p className="text-xs text-white/60 leading-relaxed flex-1">{c.desc}</p>
+              <span aria-hidden="true" className="mt-3 text-white/40 text-xs">→</span>
+            </Link>
+          ))}
+        </div>
+      </section>
+
+      <section className="py-20 px-6 bg-white/[0.02] border-t border-white/10">
+        <div className="max-w-6xl mx-auto">
+          <p className="font-mono text-[11px] tracking-widest uppercase text-white/50 mb-4 text-center">
+            Recent Deliveries
+          </p>
+          <h2 className="kx-display text-2xl md:text-3xl font-bold text-center mb-10">
+            최근 납품 사례
+          </h2>
+          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-5 gap-3">
+            {PORTFOLIO.map((p) => (
+              <div
+                key={p.title}
+                className={`p-5 rounded-2xl border ${p.borderAccent} ${p.accentBg} flex flex-col`}
+              >
+                <p className={`font-mono text-[10px] uppercase tracking-widest ${p.accentColor} mb-2`}>
+                  {p.category}
+                </p>
+                <h3 className="font-bold text-white text-sm leading-tight mb-2">{p.title}</h3>
+                <p className="text-xs text-white/60 line-clamp-3 flex-1">{p.result}</p>
+                <p className="text-xs text-white/40 mt-3">{p.priceRange}</p>
+              </div>
+            ))}
+          </div>
+        </div>
+      </section>
+
+      <section className="py-20 px-6 border-t border-white/10">
+        <div className="max-w-3xl mx-auto text-center">
+          <h2 className="kx-display text-2xl md:text-4xl font-bold mb-5">
+            견적이 필요하신가요?
+          </h2>
+          <p className="text-base text-white/70 mb-8">
+            연락처 + 작업 범위 + 희망 일정만 알려주시면 24시간 내 답변드립니다.
+          </p>
+          <button
+            onClick={() => {
+              trackCTAClick('work_hub_cta');
+              openContact('외주 개발 문의');
+            }}
+            className="kx-btn-primary inline-flex items-center px-7 py-3 rounded-full text-sm"
+          >
+            견적 문의하기
+          </button>
+        </div>
+      </section>
+    </div>
+  );
+}