Fix: skip wasted geo-IP lookup blocking the host double-click tooltip

The online-host double-click handler called IPConverter::GetGeoLocation on
the UI thread before showing the floating tooltip, even when no local IP
database (QQWry/ip2region) was loaded. In that default configuration the
result is never displayed, yet the call issues up to three synchronous HTTP
requests (5s timeout each), delaying the tooltip by a network round trip or
worse.

Only run the lookup when a local database is actually loaded, and memoize
successful results per IP in a process-wide cache inside GetGeoLocation so
the remaining call sites (license activity, host-login fallback) do not
re-query the same IP. The cache uses function-local statics rather than
class members to keep IPConverter's layout unchanged and stay ABI-compatible
with the precompiled PrivateDesktop_Lib.lib QQWry/Ip2Region subclasses.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/2015RemoteDlg.cpp

@@ -8728,8 +8728,11 @@ void CMy2015RemoteDlg::OnListClick(NMHDR* pNMHDR, LRESULT* pResult)
                         res[RES_SYSTEM_BITS], res[RES_SYSTEM_CPU], res[RES_SYSTEM_MEM], res[RES_RESOLUTION], startTime, expired.c_str(),
                         res[RES_USERNAME], res[RES_ISADMIN] == "1" ? _L("[管理员]") : res[RES_ISADMIN].IsEmpty() ? "" : _L("[非管理员]"), GetElapsedTime(startTime),
                         ctx->GetProtocol().c_str(), ctx->GetServerPort(), typMap[type].c_str(), ctx->GetMasterID().c_str(), res[RES_CLIENT_ID]);
-        std::string geo = res[RES_CLIENT_PUBIP].IsEmpty() ? "" : m_IPConverter->GetGeoLocation(res[RES_CLIENT_PUBIP].GetString());
-        if (m_HasLocDB) {
+        // 地理信息只在加载了本地 IP 库（QQWry/ip2region）时才查询并展示。
+        // 未装库时 m_IPConverter 是网络版 GetGeoLocation（同步外网 HTTP，可达数秒），
+        // 且结果不会被显示——跳过可消除双击浮窗的弹出延时。
+        if (m_HasLocDB && !res[RES_CLIENT_PUBIP].IsEmpty()) {
+            std::string geo = m_IPConverter->GetGeoLocation(res[RES_CLIENT_PUBIP].GetString());
             CString qqwryLoc;
             qqwryLoc.FormatL("\r\n地理信息: %s", geo.c_str());
             strText += qqwryLoc;