feat: support disable legacy cloud (#2006)

apps/web/preset.config.mjs

@@ -1,6 +1,9 @@
 import 'dotenv/config';
 
 const config = {
+  enableLegacyCloud: process.env.ENABLE_LEGACY_PROVIDER
+    ? process.env.ENABLE_LEGACY_PROVIDER === 'true'
+    : true,
   enableBroadCastChannelProvider: Boolean(
     process.env.ENABLE_BC_PROVIDER ?? '1'
   ),