feat: add music source service — NetEase/QQ providers, unified interface, cookie auth

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -13,8 +13,10 @@
   "license": "MIT",
   "dependencies": {
     "@discordjs/opus": "^0.10.0",
+    "axios": "^1.14.0",
     "better-sqlite3": "^12.8.0",
     "express": "^5.2.1",
+    "NeteaseCloudMusicApi": "^4.30.0",
     "pino": "^10.3.1",
     "tweetnacl": "^1.0.3",
     "ws": "^8.20.0"