fix: middleware publicRoutes 타입 에러 수정

src/middleware.ts

@@ -185,7 +185,7 @@ function isGuestOnlyRoute(pathname: string): boolean {
 }
 
 function isPublicRoute(pathname: string): boolean {
-  return AUTH_CONFIG.publicRoutes.some(route => {
+  return AUTH_CONFIG.publicRoutes.some((route: string) => {
     // '/' 는 정확히 일치해야만 public
     if (route === '/') {
       return pathname === '/';