fix: /post-register에 ProtectedRoute 적용

로그인 없이 직접 접근 시 /login으로 리다이렉트.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ImTotem

src/App.tsx

@@ -26,7 +26,9 @@ export default function App() {
         <Route element={<AuthLayout />}>
           <Route path="/login" element={<LoginPage />} />
           <Route path="/register" element={<RegisterPage />} />
-          <Route path="/post-register" element={<PostRegisterPage />} />
+          <Route element={<ProtectedRoute />}>
+            <Route path="/post-register" element={<PostRegisterPage />} />
+          </Route>
         </Route>
         <Route element={<AppLayout />}>
           <Route element={<ProtectedRoute />}>