fix(media): defer Bun S3 client loading

lib/media/storage.ts

@@ -1,8 +1,9 @@
 import "server-only";
 
-import { S3Client } from "bun";
+import type { S3Client } from "bun";
 
 let client: S3Client | undefined;
+let loading: Promise<S3Client> | undefined;
 
 function required(name: string): string {
   const value = process.env[name];
@@ -10,16 +11,18 @@ function required(name: string): string {
   return value;
 }
 
-export function getMediaStorage(): S3Client {
-  if (!client) {
-    client = new S3Client({
+export async function getMediaStorage(): Promise<S3Client> {
+  if (client) return client;
+  if (!loading) {
+    loading = import("bun").then(({ S3Client: BunS3Client }) => new BunS3Client({
       accessKeyId: required("S3_ACCESS_KEY_ID"),
       secretAccessKey: required("S3_SECRET_ACCESS_KEY"),
       bucket: required("S3_BUCKET"),
       endpoint: required("S3_ENDPOINT"),
       region: process.env.S3_REGION || "auto",
       virtualHostedStyle: process.env.S3_VIRTUAL_HOSTED_STYLE === "true",
-    });
+    }));
   }
+  client = await loading;
   return client;
 }