feat: add media option to module to restrict body max size

updated media schema to enforce strict validation, introduced `options` for AppMedia, and added a key prefix feature for StorageR2Adapter to enhance flexibility and control.

app/src/adapter/cloudflare/storage/StorageR2Adapter.ts

@@ -49,6 +49,8 @@ export function registerMedia(
  * @todo: add tests (bun tests won't work, need node native tests)
  */
 export class StorageR2Adapter extends StorageAdapter {
+   public keyPrefix: string = "";
+
    constructor(private readonly bucket: R2Bucket) {
       super();
    }
@@ -175,7 +177,7 @@ export class StorageR2Adapter extends StorageAdapter {
    }
 
    protected getKey(key: string) {
-      return key;
+      return `${this.keyPrefix}/${key}`.replace(/^\/\//, "/");
    }
 
    toJSON(secrets?: boolean) {