chore: sync plugin from AstrBotDevs/AstrBot#5997

Author: astrbot-plugin-copybara[bot]

plugins.json

@@ -1,4 +1,11 @@
 {
+  "astrbot-plugin-self-code": {
+    "display_name": "Self Code Assistant",
+    "desc": "一个用于 AstrBot 的 AI 编程助手插件。它把聊天指令转为 codex CLI 操作，在 workspace 中生成/修改插件代码，并支持测试和部署。",
+    "author": "YakumoAki",
+    "repo": "https://github.com/murphys7017/astrbot_plugin_self_code",
+    "social_link": "https://www.xiaohongshu.com/user/profile/6986d59f0000000024012e78"
+  },
   "astrbot-plugin-endfield": {
     "display_name": "终末地协议终端",
     "desc": "基于森空岛 API 的终末地插件，支持便签、理智、干员面板等查询。移植自 endfield-plugin。",