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/kg/singer.ts

@@ -0,0 +1,85 @@
+import { getMusicInfosByList } from './musicInfo.ts'
+import { createHttpFetch } from './util.ts'
+
+export default {
+  /**
+   * 获取歌手信息
+   * @param {*} id
+   */
+  getInfo(id) {
+    if (id == 0) throw new Error('歌手不存在') // kg源某些歌曲在歌手没被kg收录时返回的歌手id为0
+    return createHttpFetch(`http://mobiles.kugou.com/api/v5/singer/info?singerid=${id}`).then(body => {
+      if (!body) throw new Error('get singer info faild.')
+
+      return {
+        source: 'kg',
+        id: body.singerid,
+        info: {
+          name: body.singername,
+          desc: body.intro,
+          avatar: body.imgurl.replace('{size}', 480),
+          gender: body.grade === 1 ? 'man' : 'woman',
+        },
+        count: {
+          music: body.songcount,
+          album: body.albumcount,
+        },
+      }
+    })
+  },
+  /**
+   * 获取歌手专辑列表
+   * @param {*} id
+   * @param {*} page
+   * @param {*} limit
+   */
+  getAlbumList(id, page = 1, limit = 10) {
+    if (id == 0) throw new Error('歌手不存在')
+    return createHttpFetch(`http://mobiles.kugou.com/api/v5/singer/album?singerid=${id}&page=${page}&pagesize=${limit}`).then(body => {
+      if (!body.info) throw new Error('get singer album list faild.')
+
+      const list = this.filterAlbumList(body.info)
+      return {
+        source: 'kg',
+        list,
+        limit,
+        page,
+        total: body.total,
+      }
+    })
+  },
+  /**
+   * 获取歌手歌曲列表
+   * @param {*} id
+   * @param {*} page
+   * @param {*} limit
+   */
+  async getSongList(id, page = 1, limit = 100) {
+    if (id == 0) throw new Error('歌手不存在')
+    const body = await createHttpFetch(`http://mobiles.kugou.com/api/v5/singer/song?singerid=${id}&page=${page}&pagesize=${limit}`)
+    if (!body.info) throw new Error('get singer song list faild.')
+
+    const list = await getMusicInfosByList(body.info)
+    return {
+      source: 'kg',
+      list,
+      limit,
+      page,
+      total: body.total,
+    }
+  },
+  filterAlbumList(raw) {
+    return raw.map(item => {
+      return {
+        id: item.albumid,
+        count: item.songcount,
+        info: {
+          name: item.albumname,
+          author: item.singername,
+          img: String(item.imgurl || item.img || '').replace('{size}', '480'),
+          desc: item.intro,
+        },
+      }
+    })
+  },
+}