refactor: 架构整固——分层单向化、全量 TypeScript、直接运行

- 移除 bd/mg 两平台及磁盘残留产物；清理 api-test 死脚本、musicSdk/message+options 死模块、infSign vendor
- musicSdk/ 改名 sdk/；src/common、src/auth、src/apis 整体移入 sdk/，依赖方向定为 src → sdk 严格单向
- src/ 手写 JS 全量转 .ts，删除 JS 类型垫片 modules.d.ts；源码 import 统一 .ts 后缀
- Node 原生类型剥离直接运行 .ts（engines >=22.18），取消 tsc 发射产物，tsc 仅类型检查（pnpm typecheck）
- 删除 kwdes 备用实现与 src/index.ts 转发垫片；测试移至 test/smoke-test.ts
- common/request.ts 补显式导出类型；修复 set-cookie 单值形态、ApiError 类字段等隐患

验证：tsc 零错误，smoke-test 41/41

sdk/tx/tipSearch.ts

@@ -0,0 +1,30 @@
+import type { HttpRequestObject } from '../types.ts'
+import { httpFetch } from '../request.ts'
+
+export default {
+  // regExps: {
+  //   relWord: /RELWORD=(.+)/,
+  // },
+  requestObj: null as HttpRequestObject | null,
+  tipSearch(str) {
+    this.cancelTipSearch()
+    this.requestObj = httpFetch(`https://c.y.qq.com/splcloud/fcgi-bin/smartbox_new.fcg?is_xml=0&format=json&key=${encodeURIComponent(str)}&loginUin=0&hostUin=0&format=json&inCharset=utf8&outCharset=utf-8&notice=0&platform=yqq&needNewCode=0`, {
+      headers: {
+        Referer: 'https://y.qq.com/portal/player.html',
+      },
+    })
+    return this.requestObj.promise.then(({ statusCode, body }) => {
+      if (statusCode != 200 || body.code != 0) return Promise.reject(new Error('请求失败'))
+      return body.data
+    })
+  },
+  handleResult(rawData) {
+    return rawData.map(info => `${info.name} - ${info.singer}`)
+  },
+  cancelTipSearch() {
+    if (this.requestObj && this.requestObj.cancelHttp) this.requestObj.cancelHttp()
+  },
+  async search(str) {
+    return this.tipSearch(str).then(result => this.handleResult(result.song.itemlist))
+  },
+}