feat(sdk): kg/kw/tx/wy 补齐专辑、歌单与 parse 能力

四个主流平台从「搜索 + 取流」补到能力对齐，新增 playlist/parse
（tx、wy 另加 userPlaylist），顺带修掉酷我直链的一个真实缺陷。

- kw：酷我 CDN 回吐的 query 用 `$` 顶替 `=`（`?bitrate$320&format$mp3…`），
  `$` 非 URL 标准分隔符，播放器与解析器普遍不认，导致拿到直链也放不出声；
  统一还原成 `=` 再对外返回
- wy：补齐 album/playlist/parse/userPlaylist，与 kg/tx 能力对齐
- kg/kw/tx：接入 parse（跨平台精确匹配的输入源）与歌单

为什么单独一次提交：这批改动不动架构，只做能力补齐与 URL 规范化，
与新增平台的注册表改动分开，出问题时便于单独回滚。

sdk/wy/userPlaylist.ts

@@ -0,0 +1,95 @@
+// 网易云个人歌单（上游 music-lib/netease/user_playlist.go 移植）
+// 需登录 cookie MUSIC_U（sdk/auth/store.ts 的 getCredentials('wy').cookie / musicU）：
+//   未登录抛出清晰错误，不返回空列表
+//   1) weapi/nuser/account/get → 当前用户 userId
+//   2) weapi/user/playlist    → 用户歌单列表（分页 limit/offset）
+import { httpFetch } from '../request.ts'
+import { weapi } from './utils/crypto.ts'
+import { formatPlayCount } from '../index.ts'
+import { getCredentials, getWyCookie } from '../auth/store.ts'
+import type { WyCredentials } from '../auth/store.ts'
+
+const UA = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36'
+
+const playlistLink = (id: string) => `https://music.163.com/#/playlist?id=${id}`
+
+const readCookie = (): string => {
+  const cred = getCredentials('wy') as WyCredentials | null
+  const musicU = String(cred?.musicU ?? '').trim()
+  if (musicU) return `MUSIC_U=${musicU}`
+  return String(cred?.cookie ?? getWyCookie()).trim()
+}
+
+const weapiPost = async(url: string, data: object, cookie: string) => {
+  const { statusCode, body } = await httpFetch(url, {
+    method: 'post',
+    headers: {
+      'User-Agent': UA,
+      Referer: 'https://music.163.com/',
+      origin: 'https://music.163.com',
+      'Content-Type': 'application/x-www-form-urlencoded',
+      Cookie: cookie,
+    },
+    form: weapi(data),
+    timeout: 15000,
+  }).promise
+  if (statusCode !== 200 || !body || typeof body !== 'object') throw new Error('wy 个人歌单接口请求失败')
+  return body
+}
+
+/**
+ * 个人歌单列表（上游 GetUserPlaylists）
+ * 未登录（无 cookie/MUSIC_U）时抛出清晰错误，不返回空列表
+ */
+export const getList = async(page = 1, limit = 30) => {
+  const cookie = readCookie()
+  if (!cookie) throw new Error('wy 个人歌单需要登录 cookie（MUSIC_U），请先登录网易云')
+
+  const safePage = Math.max(1, Number(page) || 1)
+  let safeLimit = Number(limit) || 30
+  if (safeLimit <= 0) safeLimit = 30
+  if (safeLimit > 100) safeLimit = 100
+
+  const account = await weapiPost('https://music.163.com/weapi/nuser/account/get', { csrf_token: '' }, cookie)
+  if (account.code !== 200 || !account?.profile?.userId) {
+    throw new Error(`wy 登录态无效或已过期 (code ${account?.code ?? 'unknown'})`)
+  }
+  const uid = account.profile.userId
+  const nickname = account.profile.nickname ?? ''
+
+  const body = await weapiPost('https://music.163.com/weapi/user/playlist', {
+    uid,
+    limit: safeLimit,
+    offset: (safePage - 1) * safeLimit,
+    includeVideo: true,
+    csrf_token: '',
+  }, cookie)
+  if (body.code !== 200) throw new Error(`wy 个人歌单获取失败 (code ${body.code})`)
+
+  const list = (body.playlist ?? []).map(item => {
+    const id = String(item?.id ?? '').trim()
+    if (!id) return null
+    const trackCount = Number(item?.trackCount ?? 0) || 0
+    const playCount = Number(item?.playCount ?? 0) || 0
+    const creator = String(item?.creator?.nickname ?? '').trim() || nickname
+    return {
+      id,
+      name: item?.name ?? '',
+      cover: item?.coverImgUrl ?? '',
+      trackCount,
+      playCount,
+      play_count: formatPlayCount(playCount),
+      creator,
+      description: item?.description ?? '',
+      subscribed: Boolean(item?.subscribed),
+      link: playlistLink(id),
+      source: 'wy' as const,
+    }
+  }).filter(Boolean)
+
+  return { list, page: safePage, limit: safeLimit, total: list.length, source: 'wy' as const }
+}
+
+export const getUserPlaylists = getList
+
+export default { getList, getUserPlaylists }