add staging env

src/env.d.ts

@@ -1,5 +1,7 @@
 interface ImportMetaEnv {
-  readonly MODE: "production" | "development" | "none"
+  readonly PUBLIC_WEB_URL: string
+  readonly PUBLIC_BASE_URL: string
+  readonly PUBLIC_ADMIN_URL: string
 }
 
 interface ImportMeta {