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/wy/tipSearch.ts

@@ -0,0 +1,34 @@
+import { httpFetch } from '../request.ts'
+import { weapi } from './utils/crypto.ts'
+import { formatSingerName } from '../utils.ts'
+import type { HttpRequestObject } from '../types.ts'
+
+export default {
+  requestObj: null as HttpRequestObject | null,
+  cancelTipSearch() {
+    if (this.requestObj && this.requestObj.cancelHttp) this.requestObj.cancelHttp()
+  },
+  tipSearchBySong(str) {
+    this.cancelTipSearch()
+    this.requestObj = httpFetch('https://music.163.com/weapi/search/suggest/web', {
+      method: 'POST',
+      headers: {
+        referer: 'https://music.163.com/',
+        origin: 'https://music.163.com/',
+      },
+      form: weapi({
+        s: str,
+      }),
+    })
+    return this.requestObj!.promise.then(({ statusCode, body }) => {
+      if (statusCode != 200 || body.code != 200) return Promise.reject(new Error('请求失败'))
+      return body.result.songs
+    })
+  },
+  handleResult(rawData) {
+    return rawData.map(info => `${info.name} - ${formatSingerName(info.artists, 'name')}`)
+  },
+  async search(str) {
+    return this.tipSearchBySong(str).then(result => this.handleResult(result))
+  },
+}