feat: 화면 하단에 학교 동아리명 푸터 배지 추가

src/app/App.tsx

@@ -1,11 +1,13 @@
 import { RouterProvider } from 'react-router'
 import { Toaster } from 'react-hot-toast'
 import { router } from './router'
+import { FooterBadge } from '@/shared/ui'
 
 export default function App() {
   return (
     <>
       <RouterProvider router={router} />
+      <FooterBadge />
       <Toaster
         position="top-center"
         toastOptions={{

src/shared/ui/FooterBadge.tsx

@@ -0,0 +1,7 @@
+export function FooterBadge() {
+  return (
+    <p className="fixed bottom-3 left-0 right-0 z-50 text-center text-[10px] text-violet-400/50 pointer-events-none select-none tracking-wide">
+      광주소프트웨어마이스터고 스타트업 동아리
+    </p>
+  )
+}

src/shared/ui/index.ts

@@ -0,0 +1 @@
+export { FooterBadge } from './FooterBadge'