Fix: Decode geographic location as UTF-8 across client and server

Geographic location (city, country) from the geo APIs is UTF-8, but the client
and several server paths converted or stored it in the system ANSI code page,
turning umlauts ("ö"/"ä") into "?" or GBK mojibake ("B枚blingen"). Keep the
value UTF-8 end to end: the client caches it as UTF-8 and re-queries once after
an upgrade (keyed by __DATE__, the app's version convention), while the server
stores and displays it as UTF-8 in the online list, the activity log, the
client-info export, JSON/email payloads and search.

Also add a confirmation prompt before opening a remote chat from the toolbar,
with German, English and Traditional-Chinese translations.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.h

@@ -223,6 +223,9 @@ public:
     VOID AddList(CString strIP, CString strAddr, CString strPCName, CString strOS, CString strCPU, CString strVideo, CString strPing,
                  CString ver, CString startTime, std::vector<std::string>& v, CONTEXT_OBJECT* ContextObject);
     VOID ShowMessage(CString strType, CString strMsg);
+    // 消息中含 UTF-8（如地理位置）时使用：消息列经 LVM_SETITEMTEXTW 写宽字符串，
+    // 避免 UTF-8 在 ANSI 日志列表里被按 GBK 显示成乱码（Böblingen → B枚blingen）。
+    VOID ShowMessageW(const CStringW& strType, const CStringW& strMsg);
     VOID CreatStatusBar();
     VOID CreateToolBar();
     VOID CreateNotifyBar();