refactor(api)!: 平台 id 回退——joox/5sing/bili/apple 恢复全名，目录对齐 bd/mg

- 撤销 3381e9b/1b972ec 中 jx/5s/bl/ap 四个短码，恢复 joox/5sing/bili/apple；
  qian→bd、migu→mg 保留
- 目录与文件对齐保留的新 id：sdk/qian/→sdk/bd/、sdk/migu/→sdk/mg/、
  sdk/apis/qian.ts→bd.ts、migu.ts→mg.ts、src/http/migu-stream.ts→mg-stream.ts
  （规则改为「目录=对外 id」，聚合入口的模块变量同步更名；music.migu.cn 等域名、
  上游 music-lib 对照注释、miguGet 等功能标识符不动）
- 对外 id 全表：kw kg tx wy qs xm me qt lr mg bd joox 5sing bili apple

**破坏性变更**：joox/5sing/bili/apple 四平台的 URL、/sources 返回与
data/auth.json 凭据键恢复全名，已存短码键的登录态需重新登录。

验证：typecheck ✓、pnpm test 112/112 ✓

sdk/index.ts

@@ -7,8 +7,8 @@ import xm from './xm/index.ts'
 import me from './me/index.ts'
 import qt from './qt/index.ts'
 import lr from './lr/index.ts'
-import migu from './migu/index.ts'
-import qian from './qian/index.ts'
+import mg from './mg/index.ts'
+import bd from './bd/index.ts'
 import joox from './joox/index.ts'
 import bili from './bili/index.ts'
 import fivesing from './5sing/index.ts'
@@ -22,8 +22,8 @@ import { supportQualitys as xmQualitys } from './apis/xm.ts'
 import { supportQualitys as meQualitys } from './apis/me.ts'
 import { supportQualitys as qtQualitys } from './apis/qt.ts'
 import { supportQualitys as lrQualitys } from './apis/lr.ts'
-import { supportQualitys as miguQualitys } from './apis/migu.ts'
-import { supportQualitys as qianQualitys } from './apis/qian.ts'
+import { supportQualitys as mgQualitys } from './apis/mg.ts'
+import { supportQualitys as bdQualitys } from './apis/bd.ts'
 import { supportQualitys as jooxQualitys } from './apis/joox.ts'
 import { supportQualitys as biliQualitys } from './apis/bili.ts'
 import { supportQualitys as fivesingQualitys } from './apis/5sing.ts'
@@ -53,13 +53,13 @@ const SUPPORTED_SOURCES: Array<{ id: string; name: string; module: PlatformModul
   { id: 'me', name: '猫耳FM', module: me, noAggregate: true },
   { id: 'qt', name: '蜻蜓FM', module: qt, noAggregate: true },
   { id: 'lr', name: '懒人听书', module: lr, noAggregate: true },
-  { id: 'mg', name: '咪咕音乐', module: migu },
-  { id: 'bd', name: '千千音乐', module: qian },
-  { id: 'jx', name: 'JOOX', module: joox },
-  { id: 'bl', name: '哔哩哔哩', module: bili },
-  { id: '5s', name: '5sing', module: fivesing },
+  { id: 'mg', name: '咪咕音乐', module: mg },
+  { id: 'bd', name: '千千音乐', module: bd },
+  { id: 'joox', name: 'JOOX', module: joox },
+  { id: 'bili', name: '哔哩哔哩', module: bili },
+  { id: '5sing', name: '5sing', module: fivesing },
   // Apple Music 仅提供 preview 试听片段（完整曲为 DRM），不参与跨平台精确匹配
-  { id: 'ap', name: 'Apple Music', module: apple, noAggregate: true },
+  { id: 'apple', name: 'Apple Music', module: apple, noAggregate: true },
 ]
 
 const SOURCE_MODULES = Object.fromEntries(SUPPORTED_SOURCES.map((s) => [s.id, s.module]))
@@ -81,12 +81,12 @@ export const supportQuality: Record<string, string[]> = {
   me: meQualitys,
   qt: qtQualitys,
   lr: lrQualitys,
-  mg: miguQualitys,
-  bd: qianQualitys,
-  jx: jooxQualitys,
-  bl: biliQualitys,
-  '5s': fivesingQualitys,
-  ap: appleQualitys,
+  mg: mgQualitys,
+  bd: bdQualitys,
+  joox: jooxQualitys,
+  bili: biliQualitys,
+  '5sing': fivesingQualitys,
+  apple: appleQualitys,
 }
 
 const trimStr = (str: unknown): string => (typeof str === 'string' ? str.trim() : str as string)