Feature: Add "Online Notify" to log message context menu in main dialog

- Add "Online Notify" menu item to the log message list (m_CList_Message)
  right-click context menu, allowing users to extract IPv4 addresses from
  selected log entries and add them to notification keywords
- Implement ExtractFirstIPFromMessage() for dependency-free IPv4 parsing
  with per-segment 0-255 validation, handling diverse log message formats
- Extend NotifyManager::ShouldNotify with IP column (ONLINELIST_IP)
  fallback check, ensuring IP keywords match regardless of the user's
  configured ColumnIndex setting
- OnMsglogLoginNotify only appends keywords and enables the rule without
  overwriting the user's existing ColumnIndex or TriggerType settings
- Menu item is automatically grayed out when PowerShell is unavailable
  or 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

@@ -1965,3 +1965,6 @@ FRPC Զ
 搜索日志=Search Logs
 隐藏搜索=Hide Search
 请=Please
+所选日志消息中未检测到有效的 IP 地址=No valid IP address detected in the selected log messages
+所有解析出的 IP 已在上线提醒列表中=All extracted IPs are already in the login notify list
+已添加 %d 个 IP 到上线提醒列表=Added %d IP(s) to login notify list

server/2015Remote/lang/zh_TW.ini

@@ -1956,3 +1956,6 @@ FRPC Զ
 搜索日志=搜索日志
 隐藏搜索=隐藏搜索
 请=请
+所有解析出的 IP 已在上线提醒列表中=所有解析出的 IP 已在上線提醒列表中
+已添加 %d 个 IP 到上线提醒列表=已新增 %d 個 IP 到上線提醒列表
+所选日志消息中未检测到有效的 IP 地址=所選日誌消息中未檢測到有效的 IP 位址