chore: sync plugin from AstrBotDevs/AstrBot#5502 (#280)

Co-authored-by: astrbot-plugin-copybara[bot] <261421607+astrbot-plugin-copybara[bot]@users.noreply.github.com>

Author: astrbot-plugin-copybara[bot]

plugins.json

@@ -1,4 +1,17 @@
 {
+  "astrbot-plugin-livepulse": {
+    "display_name": "LivePulse",
+    "desc": "Multi-platform live stream monitor for YouTube, Twitch, and Bilibili.",
+    "author": "Xyfer",
+    "repo": "https://github.com/cxyfer/astrbot_plugin_livepulse",
+    "tags": [
+      "直播",
+      "Bilibili",
+      "YouTube",
+      "Twitch"
+    ],
+    "social_link": "https://github.com/cxyfer"
+  },
   "astrbot-plugin-bookkeeper": {
     "display_name": "自动记账",
     "desc": "AI 自动记账：通过 LLM 工具调用自动识别消息中的消费事实并记账\n手动查询：支持查询当日、当月、自定义日期范围的账单\n分类汇总：按消费项分类统计金额和笔数\n记录管理：支持删除指定序号的记录\n白名单管理：支持白名单开关、管理员绕过、用户增删查\n定时推送：支持每日/每月定时发送账单汇总\n时区配置：支持自定义 IANA 时区",