Fix: Deliver file-transfer speed via MasterSettings (was CMD_FILE_SPEED)

The file-transfer speed dialog previously sent a separate CMD_FILE_SPEED
(5 bytes) back-to-back before COMMAND_SCREEN_SPY / COMMAND_LIST_DRIVE when
opening remote desktop or file manager. The IOCP send path batches two
consecutive Send2Client calls into one WSASend of the accumulated
OutCompressedBuffer, so the client received the [FILE_SPEED][SCREEN_SPY]
command stream twice - the root cause of two remote-desktop dialogs popping
up on a single click (introduced in commit 76decec).

Fold the two values into MasterSettings (TransferChunkKb / TransferDurationMs,
uint16 each, before Reserved, sizeof unchanged at 1000) so they reach every
client on login and are broadcast to online clients when the dialog saves.
The client persists them into [transfer] on CMD_MASTERSETTING, guarded by
TransferChunkKb != 0 so older masters keep local defaults. CMD_FILE_SPEED(252)
and its client handler remain for backward compatibility, but the master no
longer sends it.

Update the design doc, the three GBK lang files' prompt entry, and the READMEs.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.cpp

@@ -2425,6 +2425,12 @@ BOOL CMy2015RemoteDlg::OnInitDialog()
     strcpy(m_settings.GetPluginUrl, THIS_CFG.GetStr("settings", "GetPluginUrl", BRAND_URL_GET_PLUGIN).c_str());
     m_settings.Authorized = !pwd.empty() && !THIS_CFG.GetStr("settings", "PwdHmac").empty();
     m_settings.IsTrail = IsTrail(pwd);
+    {
+        int chunkKb, durMs;
+        GetTransferSpeed(THIS_CFG, chunkKb, durMs);
+        m_settings.TransferChunkKb    = (uint16_t)chunkKb;
+        m_settings.TransferDurationMs = (uint16_t)durMs;
+    }
     m_bEnableFileV2 = THIS_CFG.GetInt("settings", "EnableFileV2", 0) != 0;
 
     // 缩略图配置：从 [thumbnail] 节读取（独立于 MasterSettings，纯主控端 UI 偏好）。
@@ -4770,9 +4776,6 @@ VOID CMy2015RemoteDlg::OnOnlineDesktopManager()
 {
     if (!ShouldRemoteControl())
         return;
-    // 先下发当前文件传输速度档位，再开远程桌面：避免被控端 ScreenManager 先初始化
-    // 文件上传模块（进程级引用计数）把速度锁成旧值。
-    SendFileSpeedCommand();
     int n = THIS_CFG.GetInt("settings", "DXGI");
     BOOL all = THIS_CFG.GetInt("settings", "MultiScreen", TRUE);
     CString algo = THIS_CFG.GetStr("settings", "ScreenCompress", ALGORITHM_NULL).c_str();
@@ -4782,9 +4785,6 @@ VOID CMy2015RemoteDlg::OnOnlineDesktopManager()
 
 VOID CMy2015RemoteDlg::OnOnlineFileManager()
 {
-    // 先下发文件传输速度档位，再发 COMMAND_LIST_DRIVE 开文件管理：保证被控端
-    // CFileManager 构造时读到的 [transfer] 配置已是最新值。
-    SendFileSpeedCommand();
     BYTE	bToken = COMMAND_LIST_DRIVE;
     SendSelectedCommand(&bToken, sizeof(BYTE));
 }
@@ -9363,26 +9363,14 @@ void CMy2015RemoteDlg::OnFileTransferSpeed()
     if (dlg.DoModal() == IDOK) {
         THIS_CFG.SetInt("transfer", "ChunkKb", dlg.GetChunkKb());
         THIS_CFG.SetInt("transfer", "DurationMs", dlg.GetDurMs());
-        MessageBoxL("文件传输速度已保存。上传速度重启主控端后生效；下载速度下次打开文件管理或远程桌面后生效。",
+        m_settings.TransferChunkKb    = (uint16_t)dlg.GetChunkKb();
+        m_settings.TransferDurationMs = (uint16_t)dlg.GetDurMs();
+        SendMasterSettings(nullptr, m_settings);  // 下载速度随 MasterSettings 推送给在线客户端
+        MessageBoxL("文件传输速度已保存。上传速度重启主控端后生效；下载速度已推送到在线客户端，新连接的主机也会自动获取。",
                     "提示", MB_ICONINFORMATION);
     }
 }
 
-void CMy2015RemoteDlg::SendFileSpeedCommand()
-{
-    int chunkKb, durMs;
-    GetTransferSpeed(THIS_CFG, chunkKb, durMs);
-
-    // [cmd:1][chunkKb:uint16 LE][durationMs:uint16 LE]
-    BYTE buf[5];
-    buf[0] = CMD_FILE_SPEED;
-    buf[1] = (BYTE)(chunkKb & 0xFF);
-    buf[2] = (BYTE)((chunkKb >> 8) & 0xFF);
-    buf[3] = (BYTE)(durMs & 0xFF);
-    buf[4] = (BYTE)((durMs >> 8) & 0xFF);
-    SendSelectedCommand(buf, sizeof(buf));
-}
-
 void CMy2015RemoteDlg::ApplyThumbnailSettings()
 {
     // 任何已缓存的 HBITMAP 都是按"旧 ThumbWidth"渲染的，尺寸不再可信 —— 一律清空。

server/2015Remote/2015RemoteDlg.h

@@ -351,9 +351,8 @@ public:
 
     // ===== 文件传输速度配置（[transfer] 节，ChunkKb / DurationMs） =====
     // 主控端 UI 偏好，持久化走 THIS_CFG。上传方向读 THIS_CFG（重启主控端生效）；
-    // 下载方向经 CMD_FILE_SPEED 下发到被控端（下次打开文件管理/远程桌面会话生效）。
+    // 下载方向随 MasterSettings 下发（新连接登录即收到，改档后立即推送给在线客户端）。
     void OnFileTransferSpeed();          // 高级→文件传输速度
-    void SendFileSpeedCommand();         // 把当前档位经主连接下发给被控端
     void SendThumbnailRequest(class context* ctx);// 发一次缩略图请求
     void CacheThumbnail(uint64_t clientID, const BYTE* jpeg, size_t bytes);
     void ClearThumbnailCacheEntry(uint64_t clientID);

server/2015Remote/lang/de_DE.ini

@@ -2067,4 +2067,4 @@ JPEG
 不限速=Unbegrenzt
 %s · 约 %.2f MB/s=%s · ca. %.2f MB/s
 %s · 不受限速（受网络带宽约束）=%s · Unbegrenzt (durch Netzwerkbandbreite begrenzt)
-文件传输速度已保存。上传速度重启主控端后生效；下载速度下次打开文件管理或远程桌面后生效。=Uebertragungsgeschwindigkeit gespeichert. Upload-Geschwindigkeit wird nach Neustart des Masters wirksam; Download-Geschwindigkeit beim naechsten Oeffnen des Dateimanagers oder des Remotedesktops.
+文件传输速度已保存。上传速度重启主控端后生效；下载速度已推送到在线客户端，新连接的主机也会自动获取。=Uebertragungsgeschwindigkeit gespeichert. Upload-Geschwindigkeit wird nach Neustart des Masters wirksam; Download-Geschwindigkeit wurde an Online-Clients gesendet, neu verbundene Hosts erhalten sie automatisch.

server/2015Remote/lang/en_US.ini

@@ -2068,7 +2068,7 @@ JPEG
 不限速=Unlimited
 %s · 约 %.2f MB/s=%s · about %.2f MB/s
 %s · 不受限速（受网络带宽约束）=%s · Unlimited (limited by network bandwidth)
-文件传输速度已保存。上传速度重启主控端后生效；下载速度下次打开文件管理或远程桌面后生效。=Transfer speed saved. Upload speed takes effect after restarting the master; download speed takes effect the next time you open File Manager or Remote Desktop.
+文件传输速度已保存。上传速度重启主控端后生效；下载速度已推送到在线客户端，新连接的主机也会自动获取。=Transfer speed saved. Upload speed takes effect after restarting the master; download speed has been pushed to online clients, and newly connected hosts will get it automatically.
 
 连接管理=Connections
 %s - 连接管理=%s - Connections

server/2015Remote/lang/zh_TW.ini

@@ -2059,7 +2059,7 @@ JPEG
 不限速=不限速
 %s · 约 %.2f MB/s=%s · 約 %.2f MB/s
 %s · 不受限速（受网络带宽约束）=%s · 不限速（受網路頻寬限制）
-文件传输速度已保存。上传速度重启主控端后生效；下载速度下次打开文件管理或远程桌面后生效。=檔案傳輸速度已儲存。上傳速度重啟主控端後生效；下載速度下次開啟檔案管理或遠端桌面後生效。
+文件传输速度已保存。上传速度重启主控端后生效；下载速度已推送到在线客户端，新连接的主机也会自动获取。=檔案傳輸速度已儲存。上傳速度重啟主控端後生效；下載速度已推送到線上用戶端，新連線的主機也會自動取得。
 
 连接管理=連線管理
 %s - 连接管理=%s - 連線管理