Feature: Add configurable remote-desktop quality levels menu

Add an "高级 (Advanced)" menu after "其他 (Other)" whose
"远程桌面质量等级 (Remote Desktop Quality Levels)" item opens a dialog to
edit the six preset QualityProfile levels (max FPS, max width, codec
algorithm, bitrate). The dialog edits a working copy in a full grid with
per-field validation and a restore-defaults button; on OK it persists the
values to the [quality] INI section.

The server stays authoritative: LoadQualityProfilesFromCfg loads the saved
levels at startup (falling back to GetQualityProfile defaults), and
ScreenSpyDlg now sends CMD_QUALITY_PROFILES from GetQualityProfileCfg so
new remote-desktop sessions transmit with the configured parameters. Added
en_US/de_DE/zh_TW translations for the menu and dialog strings.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.h

@@ -6,6 +6,7 @@
 #include "TrueColorToolBar.h"
 #include "IOCPServer.h"
 #include <common/location.h>
+#include "common/commands.h"
 #include <map>
 #include <unordered_map>
 #include <mutex>
@@ -328,6 +329,15 @@ public:
     void LoadThumbnailSettingsFromCfg();          // 从 THIS_CFG 读到 m_ThumbnailCfg
     void SaveThumbnailSettingsToCfg() const;      // m_ThumbnailCfg 落盘到 THIS_CFG
     void TickThumbnailRefresh();                  // TIMER_THUMBNAIL_REFRESH 主循环
+
+    // ===== 远程桌面质量等级配置（6 档 QualityProfile） =====
+    // 主控端 UI 偏好，持久化走 THIS_CFG [quality] 节。服务端权威，经 CMD_QUALITY_PROFILES
+    // 下发给客户端。仅 UI 线程访问；修改后需重开远程桌面会话才对新连接生效。
+    QualityProfile m_QualityProfiles[QUALITY_COUNT];
+    void LoadQualityProfilesFromCfg();                    // 从 THIS_CFG 读到 m_QualityProfiles（缺省回落 GetQualityProfile）
+    void SaveQualityProfilesToCfg() const;                // m_QualityProfiles 落盘到 THIS_CFG
+    const QualityProfile& GetQualityProfileCfg(int level) const;  // 供 ScreenSpyDlg 下发用
+    void OnQualityLevels();                               // 高级→远程桌面质量等级
     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);