Feat: Add whitelist action to log-list right-click menu

Adds a "白名单" item after "解除封禁" in the message-log context menu.
It extracts the IP from each selected log entry, asks for confirmation,
then adds it to the shared IPWhitelist singleton — which IOCPServer and
the DLL rate limiter already consult live — so the entry takes effect on
new connections immediately, without a restart. The whitelist is
persisted to settings\IPWhitelist the same way the Network dialog does.

- An IP already in the whitelist is reported as such and skipped.
- An IP in the IP blacklist (banned) is reported as banned and skipped,
  rather than silently removed from the blacklist.
- Menu item, confirmation, and result strings are added to the
  en_US/zh_TW/de_DE language files.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/lang/zh_TW.ini

@@ -2093,3 +2093,8 @@ TLS
 确定取消选中主机的 TLS 传输吗？（客户端下次启动生效）=確定取消選取主機的 TLS 傳輸嗎？（用戶端下次啟動生效）
 服务端未启用 TLS 证书，无法切换客户端 TLS 传输=伺服器未啟用 TLS 憑證，無法切換用戶端 TLS 傳輸
 读取服务端 TLS 证书失败，无法下发=讀取伺服器 TLS 憑證失敗，無法下發
+白名单=白名單
+确定将选中日志中的 IP 加入白名单吗？=確定將選取日誌中的 IP 加入白名單嗎？
+已将 %d 个 IP 加入白名单=已將 %d 個 IP 加入白名單
+%d 个 IP 已在白名单中=%d 個 IP 已在白名單中
+%d 个 IP 已封禁，无法加入白名单=%d 個 IP 已封禁，無法加入白名單