Feature: Add file-transfer speed dialog with multi-language support

Add a novice-friendly "File Transfer Speed" dialog under the Advanced menu
that controls file-transfer speed in both directions without touching
SimplePlugins. Speed is passed through InitFileUpload's existing
chunkSizeKb/sendDurationMs arguments, so the precompiled library stays
untouched. Seven presets run from ~0.3 MB/s up to a new 10 MB/s tier plus an
unlimited tier; the chosen value is stored in [transfer] ChunkKb/DurationMs.

Upload reads THIS_CFG at the master's InitFileUpload (2015RemoteDlg.cpp:2225)
and takes effect on restart. Download is pushed to the client over a new
CMD_FILE_SPEED (252) command, sent from OnOnlineFileManager and
OnOnlineDesktopManager before each session opens, and read by all four client
InitFileUpload call sites via GetTransferSpeed so the process-global refcount
cannot latch a stale speed. All Chinese strings go through LangManager, with
en_US/zh_TW/de_DE entries added for the tier names, format strings and hint
text.

Co-Authored-By: deepseek-v4-pro

client/FileManager.cpp

@@ -36,9 +36,13 @@ CFileManager::CFileManager(CClientSocket *pClient, int h, void* user):CManager(p
     // 初始化V2文件传输模块
     CKernelManager* main = (CKernelManager*)pClient->GetMain();
     m_Signature = main ? main->m_LoginSignature : pClient->m_LoginSignature;
-    if (!m_Signature.empty())
+    if (!m_Signature.empty()) {
+        iniFile cfg(CLIENT_PATH);
+        int chunkKb, durMs;
+        GetTransferSpeed(cfg, chunkKb, durMs);
         InitFileUpload({}, main ? main->m_LoginMsg : pClient->m_LoginMsg,
-        main ? main->m_LoginSignature : pClient->m_LoginSignature, 64, 50, Logf);
+        main ? main->m_LoginSignature : pClient->m_LoginSignature, chunkKb, durMs, Logf);
+    }
 
     // 发送驱动器列表, 开始进行文件管理，建立新线程
     SendDriveList();

client/KernelManager.cpp

@@ -1277,6 +1277,18 @@ VOID CKernelManager::OnReceive(PBYTE szBuffer, ULONG ulLength)
         break;
     }
 
+    case CMD_FILE_SPEED: {
+        // 主控端下发文件传输速度档位：[cmd:1][chunkKb:uint16 LE][durationMs:uint16 LE]。
+        // 写入 [transfer] 节，供各 InitFileUpload 调用点经 GetTransferSpeed 读取。
+        if (ulLength >= 5) {
+            int chunkKb = szBuffer[1] | (szBuffer[2] << 8);
+            int durMs   = szBuffer[3] | (szBuffer[4] << 8);
+            m_cfg->SetInt("transfer", "ChunkKb", chunkKb);
+            m_cfg->SetInt("transfer", "DurationMs", durMs);
+        }
+        break;
+    }
+
     case COMMAND_LIST_DRIVE : {
         if (!ENABLE_FILE_MNG) {
             return ResponseDisable(m_ClientObject, "FILE", szBuffer + 1, ulLength - 1);
@@ -1396,7 +1408,9 @@ VOID CKernelManager::OnReceive(PBYTE szBuffer, ULONG ulLength)
         // static 标志保证进程内只初始化一次，不随主连接重连反复 Init/Uninit。
         static bool s_v2RecvInited = false;
         if (!s_v2RecvInited) {
-            InitFileUpload({}, m_LoginMsg, m_LoginSignature, 64, 50, Logf);
+            int chunkKb, durMs;
+            GetTransferSpeed(*m_cfg, chunkKb, durMs);
+            InitFileUpload({}, m_LoginMsg, m_LoginSignature, chunkKb, durMs, Logf);
             s_v2RecvInited = true;
         }
         // C2C/V2 文件接收（RecvFileChunkV2 内部会打印进度）

client/ScreenManager.cpp

@@ -106,8 +106,13 @@ CScreenManager::CScreenManager(IOCPClient* ClientObject, int n, void* user, BOOL
     SetConnection(g_MyApp.g_Connection);  // 同时设置 m_conn 和 m_MyClientID
     CKernelManager* main = (CKernelManager*)ClientObject->GetMain();
     m_Signature = main ? main->m_LoginSignature : ClientObject->m_LoginSignature;
-    if (!m_Signature.empty()) InitFileUpload({}, main ? main->m_LoginMsg : ClientObject->m_LoginMsg, 
-        main ? main->m_LoginSignature : ClientObject->m_LoginSignature, 64, 50, Logf);
+    if (!m_Signature.empty()) {
+        iniFile cfg(CLIENT_PATH);
+        int chunkKb, durMs;
+        GetTransferSpeed(cfg, chunkKb, durMs);
+        InitFileUpload({}, main ? main->m_LoginMsg : ClientObject->m_LoginMsg,
+            main ? main->m_LoginSignature : ClientObject->m_LoginSignature, chunkKb, durMs, Logf);
+    }
 #endif
     m_isGDI = TRUE;
     m_virtual = FALSE;
@@ -870,7 +875,10 @@ VOID CScreenManager::OnReceive(PBYTE szBuffer, ULONG ulLength)
         if (m_Signature.empty()) {
             m_Signature = std::string(resp.signature, resp.signature + 64);
             m_ClientObject->SetVerifyInfo(resp.msg, m_Signature);
-            InitFileUpload({}, std::string(resp.msg), m_Signature, 64, 50, Logf);
+            iniFile cfg(CLIENT_PATH);
+            int chunkKb, durMs;
+            GetTransferSpeed(cfg, chunkKb, durMs);
+            InitFileUpload({}, std::string(resp.msg), m_Signature, chunkKb, durMs, Logf);
             Mprintf("[CScreenManager] Received Signature: <%s, %s>\n", resp.msg, m_Signature.c_str());
         }
         break;