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/hotSearch.ts

@@ -0,0 +1,55 @@
+import type { HttpRequestObject } from '../types.ts'
+import { httpFetch } from '../request.ts'
+
+export default {
+  _requestObj: null as HttpRequestObject | null,
+  async getList(retryNum = 0) {
+    if (this._requestObj) this._requestObj.cancelHttp()
+    if (retryNum > 2) return Promise.reject(new Error('try max num'))
+
+    // const _requestObj = httpFetch('https://c.y.qq.com/splcloud/fcgi-bin/gethotkey.fcg', {
+    //   method: 'get',
+    //   headers: {
+    //     Referer: 'https://y.qq.com/portal/player.html',
+    //   },
+    // })
+    const _requestObj = httpFetch('https://u.y.qq.com/cgi-bin/musicu.fcg', {
+      method: 'post',
+      body: {
+        comm: {
+          ct: '19',
+          cv: '1803',
+          guid: '0',
+          patch: '118',
+          psrf_access_token_expiresAt: 0,
+          psrf_qqaccess_token: '',
+          psrf_qqopenid: '',
+          psrf_qqunionid: '',
+          tmeAppID: 'qqmusic',
+          tmeLoginType: 0,
+          uin: '0',
+          wid: '0',
+        },
+        hotkey: {
+          method: 'GetHotkeyForQQMusicPC',
+          module: 'tencent_musicsoso_hotkey.HotkeyService',
+          param: {
+            search_id: '',
+            uin: 0,
+          },
+        },
+      },
+      headers: {
+        Referer: 'https://y.qq.com/portal/player.html',
+      },
+    })
+    const { body, statusCode } = await _requestObj.promise
+    // console.log(body)
+    if (statusCode != 200 || body.code !== 0) throw new Error('获取热搜词失败')
+    // console.log(body)
+    return { source: 'tx', list: this.filterList(body.hotkey.data.vec_hotkey) }
+  },
+  filterList(rawList) {
+    return rawList.map(item => item.query)
+  },
+}