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/utils/crypto.ts

@@ -0,0 +1,54 @@
+// https://github.com/Binaryify/NeteaseCloudMusicApi/blob/master/util/crypto.js
+import { createCipheriv, createDecipheriv, publicEncrypt, randomBytes, createHash, constants } from 'crypto'
+const iv = Buffer.from('0102030405060708')
+const presetKey = Buffer.from('0CoJUm6Qyw8W8jud')
+const linuxapiKey = Buffer.from('rFgB&h#%2?^eDg:Q')
+const base62 = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
+const publicKey = '-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDgtQn2JZ34ZC28NWYpAUd98iZ37BUrX/aKzmFbt7clFSs6sXqHauqKWqdtLkF2KexO40H1YTX8z2lSgBBOAxLsvaklV8k4cBFK9snQXE9/DDaFt6Rr7iVZMldczhC0JNgTz+SHXT6CBHuX3e9SdB1Ua44oncaTWz7OBGLbCiK45wIDAQAB\n-----END PUBLIC KEY-----'
+const eapiKey = 'e82ckenh8dichen8'
+
+const aesEncrypt = (buffer: Buffer, mode: string, key: Buffer | string, iv: Buffer | string): Buffer => {
+  const cipher = createCipheriv(mode, key, iv)
+  return Buffer.concat([cipher.update(buffer), cipher.final()])
+}
+
+const aesDecrypt = function(cipherBuffer: Buffer, mode: string, key: Buffer | string, iv: Buffer | string): Buffer {
+  let decipher = createDecipheriv(mode, key, iv)
+  return Buffer.concat([decipher.update(cipherBuffer), decipher.final()])
+}
+
+const rsaEncrypt = (buffer: Buffer, key: string): Buffer => {
+  buffer = Buffer.concat([Buffer.alloc(128 - buffer.length), buffer])
+  return publicEncrypt({ key, padding: constants.RSA_NO_PADDING }, buffer)
+}
+
+export const weapi = (object: object): { params: string, encSecKey: string } => {
+  const text = JSON.stringify(object)
+  const secretKey = randomBytes(16).map(n => ((base62.charAt(n % 62) as any).charCodeAt())) as Buffer
+  return {
+    params: aesEncrypt(Buffer.from(aesEncrypt(Buffer.from(text), 'aes-128-cbc', presetKey, iv).toString('base64')), 'aes-128-cbc', secretKey, iv).toString('base64'),
+    encSecKey: rsaEncrypt(secretKey.reverse(), publicKey).toString('hex'),
+  }
+}
+
+export const linuxapi = (object: object): { eparams: string } => {
+  const text = JSON.stringify(object)
+  return {
+    eparams: aesEncrypt(Buffer.from(text), 'aes-128-ecb', linuxapiKey, '').toString('hex').toUpperCase(),
+  }
+}
+
+
+export const eapi = (url: string, object: object | string): { params: string } => {
+  const text = typeof object === 'object' ? JSON.stringify(object) : object
+  const message = `nobody${url}use${text}md5forencrypt`
+  const digest = createHash('md5').update(message).digest('hex')
+  const data = `${url}-36cd479b6b5-${text}-36cd479b6b5-${digest}`
+  return {
+    params: aesEncrypt(Buffer.from(data), 'aes-128-ecb', eapiKey, '').toString('hex').toUpperCase(),
+  }
+}
+
+export const eapiDecrypt = (cipherBuffer: Buffer): string => {
+  return aesDecrypt(cipherBuffer, 'aes-128-ecb', eapiKey, '').toString()
+}