Revert "feat(streams): add phase-2 SFU transport handshake and produce/consume APIs"

This reverts commit 498a7f838b7747470b220701505c4bfbd3ea8cff.

Backend/media/sfu/service.ts

@@ -1,20 +1,14 @@
 import { mediaMode } from '../config';
-import { MediasoupSfuService } from './mediasoup';
 import { NoopSfuService } from './noop';
 import type { SfuService } from './types';
 
-const sfuEngine = (process.env.MEDIA_SFU_ENGINE ?? 'mediasoup').trim().toLowerCase();
-
 const createSfuService = (): SfuService | null => {
   if (mediaMode !== 'single_server_sfu') {
     return null;
   }
 
-  if (sfuEngine === 'noop') {
-    return new NoopSfuService();
-  }
-
-  return new MediasoupSfuService();
+  return new NoopSfuService();
 };
 
 export const sfuService = createSfuService();
+