feat(ai-character): 관리자 인증 셸 구현

src/app/route-paths.ts

@@ -0,0 +1,7 @@
+export const routePaths = {
+  accessDenied: "/access-denied",
+  login: "/login",
+  aiCharacters: "/ai-characters",
+} as const;
+
+export type RoutePath = (typeof routePaths)[keyof typeof routePaths];