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/file/online/ReceiveOnlineFile.ts

@@ -0,0 +1,37 @@
+import { OneBotAction } from '@/snowcat-onebot/action/OneBotAction';
+import { ActionName } from '@/snowcat-onebot/action/router';
+import { Static, Type } from '@sinclair/typebox';
+import { ChatType } from 'snowcat-core/types';
+
+export const ReceiveOnlineFilePayloadSchema = Type.Object({
+  user_id: Type.String({ description: '用户 QQ' }),
+  msg_id: Type.String({ description: '消息 ID' }),
+  element_id: Type.String({ description: '元素 ID' }),
+});
+
+export type ReceiveOnlineFilePayload = Static<typeof ReceiveOnlineFilePayloadSchema>;
+
+export class ReceiveOnlineFile extends OneBotAction<ReceiveOnlineFilePayload, any> {
+  override actionName = ActionName.ReceiveOnlineFile;
+  override payloadSchema = ReceiveOnlineFilePayloadSchema;
+  override returnSchema = Type.Any({ description: '接收结果' });
+  override actionSummary = '接收在线文件';
+  override actionTags = ['文件扩展'];
+  override payloadExample = {
+    user_id: '123456789',
+    msg_id: '123',
+    save_path: 'C:\\save',
+  };
+
+  override returnExample = null;
+
+  async _handle (payload: ReceiveOnlineFilePayload) {
+    // 默认下载路径
+    const uid = await this.core.apis.UserApi.getUidByUinV2(payload.user_id.toString());
+    if (!uid) throw new Error('User not found');
+
+    const peer = { chatType: ChatType.KCHATTYPEC2C, peerUid: uid };
+
+    return await this.core.apis.OnlineApi.receiveOnlineFileOrFolder(peer, payload.msg_id, payload.element_id);
+  }
+}