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-core/packet/transformer/base.ts

@@ -0,0 +1,25 @@
+import { NapProtoDecodeStructType } from 'snowcat-protobuf';
+import { PacketMsgBuilder } from '@/snowcat-core/packet/message/builder';
+
+export type PacketBuf = Buffer & { readonly hexNya: unique symbol; };
+
+export const PacketBufBuilder = (str: Uint8Array): PacketBuf => {
+  return Buffer.from(str) as PacketBuf;
+};
+
+export interface OidbPacket {
+  cmd: string;
+  data: PacketBuf;
+}
+
+export abstract class PacketTransformer<T> {
+  protected msgBuilder: PacketMsgBuilder;
+
+  constructor () {
+    this.msgBuilder = new PacketMsgBuilder();
+  }
+
+  abstract build (...args: any[]): OidbPacket | Promise<OidbPacket>;
+
+  abstract parse (data: Buffer): NapProtoDecodeStructType<T>;
+}