chore: sync plugin from AstrBotDevs/AstrBot#6111

Author: astrbot-plugin-copybara[bot]

plugins.json

@@ -1,4 +1,15 @@
 {
+  "astrbot-plugin-weibo-monitor": {
+    "display_name": "微博监控插件",
+    "desc": "定时监控微博用户动态并推送到指定会话。",
+    "author": "Sayaka",
+    "repo": "https://github.com/jiantoucn/astrbot_plugin_weibo_monitor",
+    "tags": [
+      "微博",
+      "定时"
+    ],
+    "social_link": "https://github.com/jiantoucn"
+  },
   "astrbot-plugin-content-safety-guard": {
     "display_name": "阿瓦隆Avalon",
     "desc": "内容安全守卫 - 拦截用户提示词攻击和模型输出偏离人设问题，支持前置/后置审核、关键词匹配、LLM自审查、黑名单等功能",