Feature: Add "Unban IP" to log message context menu in main dialog

- Add "Unban IP" menu item to the log message list (m_CList_Message)
  right-click context menu, performing two actions on the extracted IP:
  1. Remove the IP from the IPBlacklist singleton and persist to config
  2. Scan the entire history host list (m_ClientMap->GetAll()) for all
     clients matching the IP with AUTH_FORBIDDEN status, and restore
     them to UNAUTHORIZED (0) — requiring re-authorization for safety
- Reuses ExtractFirstIPFromMessage() for dependency-free IPv4 parsing
- Handles the case where an IP is not in the blacklist and has no
  matching forbidden clients with a clear "no action needed" message
- Menu item is grayed out when no log entry is selected
- Sync en_US / zh_TW language files with new translation strings

Co-Authored-By: DeepSeek V4 Pro

server/2015Remote/lang/en_US.ini

@@ -1973,3 +1973,7 @@ FRPC Զ
 %d 个 IP 已在黑名单中=%d IP(s) already in blacklist
 %d 个 IP 在白名单中，已跳过=%d IP(s) in whitelist, skipped
 未执行任何操作=No action taken
+解除封禁=Unban IP
+已将 %d 个 IP 从黑名单移除=Removed %d IP(s) from blacklist
+已恢复 %d 个客户端的授权状态=Restored authorization for %d client(s)
+未找到需要解除封禁的 IP=No IPs found that need unbanning