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/kw/musicSearch.ts

@@ -0,0 +1,127 @@
+// import '../../polyfill/array.find.js'
+
+import { httpFetch } from '../request.ts'
+import { formatPlayTime, decodeName } from '../index.ts'
+// import { debug } from '../../utils/env.ts'
+import { formatSinger } from './util.ts'
+import type { Quality, QualityInfo, SongInfo, SongType } from '../types.ts'
+
+export default {
+  regExps: {
+    mInfo: /level:(\w+),bitrate:(\d+),format:(\w+),size:([\w.]+)/,
+  },
+  limit: 30,
+  total: 0,
+  page: 0,
+  allPage: 1,
+  // cancelFn: null,
+  musicSearch(str: string, page: number, limit: number) {
+    const musicSearchRequestObj = httpFetch(`http://search.kuwo.cn/r.s?client=kt&all=${encodeURIComponent(str)}&pn=${page - 1}&rn=${limit}&uid=794762570&ver=kwplayer_ar_9.2.2.1&vipver=1&show_copyright_off=1&newver=1&ft=music&cluster=0&strategy=2012&encoding=utf8&rformat=json&vermerge=1&mobi=1&issubtitle=1`)
+    return musicSearchRequestObj.promise
+  },
+  // getImg(songId) {
+  //   return httpGet(`http://player.kuwo.cn/webmusic/sj/dtflagdate?flag=6&rid=MUSIC_${songId}`)
+  // },
+  // getLrc(songId) {
+  //   return httpGet(`http://mobile.kuwo.cn/mpage/html5/songinfoandlrc?mid=${songId}&flag=0`)
+  // },
+  handleResult(rawData: any) {
+    const result: SongInfo[] = []
+    if (!rawData) return result
+    // console.log(rawData)
+    for (let i = 0; i < rawData.length; i++) {
+      const info = rawData[i]
+      let songId = info.MUSICRID.replace('MUSIC_', '')
+      // const format = (info.FORMATS || info.formats).split('|')
+
+      if (!info.N_MINFO) {
+        console.log('N_MINFO is undefined')
+        return null
+      }
+
+      const types: SongType[] = []
+      const _types: Partial<Record<Quality, QualityInfo>> = {}
+
+      let infoArr = info.N_MINFO.split(';')
+      for (let info of infoArr) {
+        info = info.match(this.regExps.mInfo)
+        if (info) {
+          switch (info[2]) {
+            case '4000':
+              types.push({ type: 'flac24bit', size: info[4] })
+              _types.flac24bit = {
+                size: info[4].toLocaleUpperCase(),
+              }
+              break
+            case '2000':
+              types.push({ type: 'flac', size: info[4] })
+              _types.flac = {
+                size: info[4].toLocaleUpperCase(),
+              }
+              break
+            case '320':
+              types.push({ type: '320k', size: info[4] })
+              _types['320k'] = {
+                size: info[4].toLocaleUpperCase(),
+              }
+              break
+            case '128':
+              types.push({ type: '128k', size: info[4] })
+              _types['128k'] = {
+                size: info[4].toLocaleUpperCase(),
+              }
+              break
+          }
+        }
+      }
+      types.reverse()
+
+      let interval = parseInt(info.DURATION)
+
+      result.push({
+        name: decodeName(info.SONGNAME),
+        singer: formatSinger(decodeName(info.ARTIST)),
+        source: 'kw',
+        // img = (info.album.name === '' || info.album.name === '空')
+        //   ? `http://player.kuwo.cn/webmusic/sj/dtflagdate?flag=6&rid=MUSIC_160911.jpg`
+        //   : `https://y.gtimg.cn/music/photo_new/T002R500x500M000${info.album.mid}.jpg`
+        songmid: songId,
+        albumId: decodeName(info.ALBUMID || ''),
+        interval: Number.isNaN(interval) ? 0 : formatPlayTime(interval),
+        albumName: info.ALBUM ? decodeName(info.ALBUM) : '',
+        lrc: null,
+        img: null,
+        otherSource: null,
+        types,
+        _types,
+        typeUrl: {},
+      })
+    }
+    // console.log(result)
+    return result
+  },
+  search(str: string, page = 1, limit?: number, retryNum = 0) {
+    if (retryNum > 2) return Promise.reject(new Error('try max num'))
+    if (limit == null) limit = this.limit
+    // http://newlyric.kuwo.cn/newlyric.lrc?62355680
+    return this.musicSearch(str, page, limit).then(({ body: result }) => {
+      // console.log(result)
+      if (!result || (result.TOTAL !== '0' && result.SHOW === '0')) return this.search(str, page, limit, ++retryNum)
+      let list = this.handleResult(result.abslist)
+
+      if (list == null) return this.search(str, page, limit, ++retryNum)
+
+      this.total = parseInt(result.TOTAL)
+      this.page = page
+      this.allPage = Math.ceil(this.total / limit)
+
+      return Promise.resolve({
+        list,
+        allPage: this.allPage,
+        total: this.total,
+        limit,
+        source: 'kw',
+      })
+    })
+  },
+}