관리자부분 추가

src/App.tsx

@@ -70,9 +70,6 @@ function App() {
                 <Route path="boards" element={<AdminBoards />} />
                 <Route path="users"  element={<AdminUsers />} />
               </Route>
-
-              {/* 404 처리(선택) */}
-              <Route path="*" element={<Navigate to="/" replace />} />
             </Routes>
           </Layout>
         </Router>