Revert "Feat: file transfer, resume (#12557)" (#12620)

This reverts commit 43ec57c769.

src/ipc.rs

@@ -26,9 +26,7 @@ use hbb_common::{
     config::{self, keys::OPTION_ALLOW_WEBSOCKET, Config, Config2},
     futures::StreamExt as _,
     futures_util::sink::SinkExt,
-    log,
-    message_proto::FileTransferSendConfirmRequest,
-    password_security as password, timeout,
+    log, password_security as password, timeout,
     tokio::{
         self,
         io::{AsyncRead, AsyncWrite},
@@ -107,7 +105,6 @@ pub enum FS {
         last_modified: u64,
         is_upload: bool,
     },
-    SendConfirm(Vec<u8>),
     Rename {
         id: i32,
         path: String,