chore: sync plugin from AstrBotDevs/AstrBot#5497

Author: astrbot-plugin-copybara[bot]

plugins.json

@@ -1,4 +1,13 @@
 {
+  "astrbot-plugin-steammod-monitor": {
+    "display_name": "steam创意工坊检测/服主开服工具",
+    "desc": "用于监控steam的创意工坊和mod状态变更，并在状态变化时推送通知。硬核游戏服主（僵尸毁灭工程、方舟、Rust等）打造的“赛博网监”级 AstrBot 插件。 彻底告别“玩家进不去服务器才发现模组更新”的窘境，实现全自动更新预警与优雅的群组推送和管理！",
+    "author": "danfong1104",
+    "repo": "https://github.com/danfong1104/astrbot_plugin_steammod_monitor",
+    "tags": [
+      "steam"
+    ]
+  },
   "astrbot-plugin-memos-pusher": {
     "display_name": "Memos 灵感推送",
     "desc": "快速将灵感推送到 Memos，支持 /memo 指令。",