refactor(sdk): 审计 P2 卫生项清理——请求层收敛与死代码清除

- 删除旧 sdk/request.ts，全部 import 收敛到 sdk/common/request.ts（85 文件）
- 注释死代码 630+ 行、裸 console.log 吞错 6 处、未使用符号 26 处清零
- bili 状态校验去重；utils DNS 预解析失败日志改 warn 带上下文
- CODE-AUDIT.md：第四节 P2 清理记录 + 第八节线索逐条复核结论（kw/kg/tx/wy parse 骨架相似实质各异，不抽公共层）

sdk/apis/joox.ts

@@ -10,7 +10,7 @@
 // 统一接口约定：apis('jx').getMusicUrl(songInfo, type) → { promise, cancelHttp }
 // promise resolve → { type, url }（type 为实际命中档位，可能低于请求值）
 
-import { httpFetch } from '../request.ts'
+import { httpFetch } from '../common/request.ts'
 import { jooxHeaders, normalizeJooxID } from '../joox/util.ts'
 import { buildTrackUrl } from '../joox/musicInfo.ts'
 

sdk/apis/lr.ts

@@ -3,7 +3,7 @@
 // 实测（2026-10-02）：免费章节匿名也返回 status=2 "收费章节未购买"——必须携带 /login/lr 登录会话；
 // 成功响应 list[0].path 为音频直链。
 // songmid 为复合 id "<bookId>:<section>"（/album/lr 章节列表产出）；纯 bookId 视为第一章
-import { httpFetch } from '../request.ts'
+import { httpFetch } from '../common/request.ts'
 import { getLrCookie } from '../lr/auth.ts'
 
 const UA_MI = 'Mozilla/5.0 (Linux; U; Android 4.1.1; zh-cn; MI2 Build/JRO03L) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 XiaoMi/MiuiBrowser/1.0'

sdk/apis/me.ts

@@ -32,7 +32,7 @@ const pickUrl = (info: any, type: string) => {
 
 /** 剧条目 "d:<drama_id>" → 首个免费集的 sound_id（getdrama episodes.episode[]） */
 const resolveDramaFirstFree = async(dramaId: string): Promise<string> => {
-  const { httpFetch } = await import('../request.ts')
+  const { httpFetch } = await import('../common/request.ts')
   const { statusCode, body } = await httpFetch(`https://www.missevan.com/dramaapi/getdrama?drama_id=${dramaId}`, {
     headers: {
       'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36',

sdk/apis/migu.ts

@@ -2,9 +2,9 @@
 // 命中可访问的最高档位；匿名仅 PQ(128k) 可用，HQ/SQ/ZQ 各档需登录 Cookie。
 // 上游对应：music-lib/migu/download.go（GetDownloadInfo / buildMiguDownloadCandidates /
 //   selectHighestValidDownload / rewriteMiguToneURL / embeddedDownloadInfoFromResponse）
-import { httpFetch } from '../request.ts'
+import { httpFetch } from '../common/request.ts'
 import {
-  AndroidChannel, AndroidUA, AndroidVersion, buildUrl, decryptZ3D, firstNonEmpty,
+  AndroidChannel, AndroidUA, AndroidVersion, decryptZ3D, firstNonEmpty,
   getMiguCookie, isMiguAudioMagic, miguFormatExt, TONE_QUALITY, type MiguSongItem,
 } from '../migu/util.ts'
 
@@ -112,15 +112,6 @@ const normalizeDownloadURL = (rawURL?: string | null): string => {
   return url
 }
 
-const isEncryptedDirectURL = (rawURL: string): boolean => {
-  try {
-    const decodedPath = decodeURIComponent(new URL(rawURL).pathname)
-    return decodedPath.includes('wav_3d/') && !decodedPath.includes('wav_3d_60s/')
-  } catch {
-    return false
-  }
-}
-
 interface DownloadInfo {
   url: string
   format: string