fix(client): set `duplex: 'half'` when a ReadableStream is passed

.changeset/sharp-rings-brake.md

···
+---
+'@atcute/client': patch
+---
+
+set `duplex: 'half'` when a ReadableStream is passed

packages/clients/client/lib/client.ts

···
 				'content-type': input && !isWebInput ? 'application/json' : null,
 				'atproto-proxy': _constructProxyHeader(this.proxy),
 			}),
+			duplex: input instanceof ReadableStream ? 'half' : undefined,
 		});
 
 		{

packages/clients/client/lib/env.d.ts

···
 import type {} from '@atcute/atproto';
+
+declare global {
+	interface RequestInit {
+		duplex?: 'half' | 'full';
+	}
+}