feat: support legacy routes

Summary:

Test Plan:

src/controllers/episodes/index.ts

@@ -11,4 +11,10 @@ app.route(
   await import("./getEpisodeUrl").then((controller) => controller.default),
 );
 
+// TODO: Remove this route once v2 is ready
+app.route(
+  "/",
+  await import("./getEpisodesLegacy").then((controller) => controller.default),
+);
+
 export default app;