[feat] solution/frontend: 랜딩 하단에 사업자 정보 표기 — showBusinessInfo 로 랜딩에만

solution/frontend/src/components/layout/MarketingShell.tsx

@@ -20,9 +20,11 @@ const NAV = [
 export function MarketingShell({
   children,
   showAuthCta = true,
+  showBusinessInfo = false,
 }: {
   children: ReactNode;
   showAuthCta?: boolean;
+  showBusinessInfo?: boolean;
 }) {
   const user = useAuthStore((s) => s.user);
 
@@ -80,7 +82,8 @@ export function MarketingShell({
       <main>{children}</main>
 
       <footer className="mt-24 border-t border-border">
-        <div className="mx-auto flex w-full max-w-6xl flex-col gap-3 px-5 py-10 text-xs text-muted-foreground sm:flex-row sm:items-center sm:justify-between">
+        <div className="mx-auto flex w-full max-w-6xl flex-col gap-6 px-5 py-10 text-xs text-muted-foreground">
+          <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
             <img src="/brand/web4ai-wordmark.svg" alt="Web4Ai" className="h-6 w-auto opacity-60" />
             <div className="flex gap-5">
               {NAV.map(({to, label}) => (
@@ -90,6 +93,23 @@ export function MarketingShell({
               ))}
             </div>
           </div>
+
+          {showBusinessInfo && (
+            <address className="space-y-1 leading-relaxed not-italic">
+              <p className="font-medium text-foreground/80">㈜에이아이오투오</p>
+              <p>사업자 등록번호 : 620-87-00810 | 대표 : 안성민</p>
+              <p>본사 : 대구광역시 북구 옥산로 111, 5층 유니콘랩 대구 A05호</p>
+              <p>연구소 : 경기 성남시 수정구 금토로 32 (금토동) (주)KT 판교빌딩 504호~505호 (East)</p>
+              <p>전화 : 070-4260-8310 | 010-2755-6463</p>
+              <p>
+                이메일 :{' '}
+                <a href="mailto:o2oteam@o2o.kr" className="transition-colors hover:text-foreground">
+                  o2oteam@o2o.kr
+                </a>
+              </p>
+            </address>
+          )}
+        </div>
       </footer>
     </div>
   );

solution/frontend/src/pages/LandingPage.tsx

@@ -86,7 +86,7 @@ export function LandingPage() {
   };
 
   return (
-    <MarketingShell showAuthCta={buildMode}>
+    <MarketingShell showAuthCta={buildMode} showBusinessInfo>
       {/* ── 상단 ─────────────────────────────────────── */}
       <section className="relative flex min-h-[calc(100dvh-4rem)] items-center overflow-hidden border-b border-border">
         <div className="mx-auto w-full max-w-6xl px-5 text-center">