클라이언트 비밀키 재발급(Rotate) API 구현

backend/cmd/server/main.go

@@ -613,6 +613,7 @@ func main() {
 	dev.Post("/clients", devHandler.CreateClient)
 	dev.Get("/clients/:id", devHandler.GetClient)
 	dev.Put("/clients/:id", devHandler.UpdateClient)
+	dev.Post("/clients/:id/secret/rotate", devHandler.RotateClientSecret)
 	dev.Patch("/clients/:id/status", devHandler.UpdateClientStatus)
 	dev.Delete("/clients/:id", devHandler.DeleteClient)
 	dev.Get("/consents", devHandler.ListConsents)