Feature: Add configurable screen-preview quality levels menu

Add a "屏幕预览质量等级 (Screen Preview Quality Levels)" item to the
"高级 (Advanced)" menu that opens a dialog to edit the six preset
PreviewProfile levels (target encode width and JPEG quality) used by the
double-click single-preview and loop-snapshot floating windows. 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 [preview] INI
section.

ChooseScreenPreviewParams now reads from GetPreviewProfileCfg instead of the
hardcoded GetScreenPreviewProfile table, so preview requests sent after a
change use the configured parameters. LoadPreviewProfilesFromCfg loads the
saved levels at startup, falling back to the built-in defaults. Added
en_US/de_DE/zh_TW translations for the new menu and dialog strings.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/resource.h

@@ -354,6 +354,7 @@
 #define IDC_DOT                         2036
 #define IDD_AUDIO                       2038
 #define IDD_QUALITY_LEVELS              3000
+#define IDD_PREVIEW_LEVELS              3001
 #define IDI_AUDIO                       2039
 #define IDC_LIST_REMOTE                 2040
 #define IDC_LIST_LOCAL                  2041
@@ -1038,19 +1039,23 @@
 #define ID_ONLINE_HISTORY_ACTIVITY      33082
 #define ID_EXIT_FULLSCREEN              40001
 #define ID_TOOL_QUALITY_LEVELS          33083
+#define ID_TOOL_PREVIEW_LEVELS          33084
 #define IDC_QLEVEL_FPS                  2547
 #define IDC_QLEVEL_WIDTH                2553
 #define IDC_QLEVEL_ALGO                 2559
 #define IDC_QLEVEL_BITRATE              2565
 #define IDC_QLEVEL_RESET                2571
+#define IDC_PLEVEL_WIDTH                2572
+#define IDC_PLEVEL_QUALITY              2578
+#define IDC_PLEVEL_RESET                2584
 
 // Next default values for new objects
 // 
 #ifdef APSTUDIO_INVOKED
 #ifndef APSTUDIO_READONLY_SYMBOLS
 #define _APS_NEXT_RESOURCE_VALUE        401
-#define _APS_NEXT_COMMAND_VALUE         33083
-#define _APS_NEXT_CONTROL_VALUE         2542
+#define _APS_NEXT_COMMAND_VALUE         33085
+#define _APS_NEXT_CONTROL_VALUE         2585
 #define _APS_NEXT_SYMED_VALUE           105
 #endif
 #endif