SnowCat 雪猫底层全源码：NapCat 4.18.28 底座 + SnowLuma 能力移植 + V8 通道适配 9.9.37

26 包 monorepo（TS 全源码）：
- snowcat-core: NT 内核 API 封装 + listener（含 9.9.37 六回调适配）+ Packet 发包
- snowcat-onebot: OneBot v11 全动作 + MCP Streamable HTTP 适配器 + 稳定线
- snowcat-webui-frontend/backend: 雪猫控制台（React+HeroUI）
- snowcat-shell: 单文件 bundle 出口（vite inlineDynamicImports）
- snowcat-native: napi2native / MoeHoo / ffmpeg / pty 运行时
- 56 项 SnowLuma 独门动作移植（qzone 全家桶/群相册/装扮/闪照/收藏）
- 工具件: 解包器/启动器/便携制作器/doctor

GitHub 关联已全量指向 DandanLLab/SnowCatQQ

packages/snowcat-onebot/action/group/SendGroupMsg.ts

@@ -0,0 +1,29 @@
+import { ContextMode, ReturnDataType, SendMsgBase, SendMsgPayload } from '@/snowcat-onebot/action/msg/SendMsg';
+import { ActionName, BaseCheckResult } from '@/snowcat-onebot/action/router';
+
+import { GroupActionsExamples } from '../example/GroupActionsExamples';
+import { snowCatStable } from '@/snowcat-onebot/stable-line';
+
+// 未检测参数
+class SendGroupMsg extends SendMsgBase {
+  override actionName = ActionName.SendGroupMsg;
+  override actionSummary = '发送群消息';
+  override actionDescription = '发送群消息';
+  override actionTags = ['群组接口'];
+  override payloadExample = GroupActionsExamples.SendGroupMsg.payload;
+  override returnExample = GroupActionsExamples.SendGroupMsg.response;
+
+  protected override async check (payload: SendMsgPayload): Promise<BaseCheckResult> {
+    delete payload.user_id;
+    payload.message_type = 'group';
+    return super.check(payload);
+  }
+
+  override async _handle (payload: SendMsgPayload): Promise<ReturnDataType> {
+    // SnowCat 稳定线：真人抖动+账号预算+熔断
+    await snowCatStable.stableDelay();
+    return this.base_handle(payload, ContextMode.Group);
+  }
+}
+
+export default SendGroupMsg;