feat: bundle FFmpeg via ffmpeg-static for one-click deployment

Users no longer need to install FFmpeg separately — it is now bundled as
an npm dependency (ffmpeg-static). player.ts resolves the bundled binary
automatically and falls back to system PATH. start.bat and a new
setup.bat script handle dependency installation and project building.

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

package.json

@@ -15,9 +15,16 @@
   "dependencies": {
     "@discordjs/opus": "^0.10.0",
     "@honeybbq/teamspeak-client": "^0.1.0",
+    "@koa/router": "^15.4.0",
+    "@sansenjian/qq-music-api": "^2.2.9",
     "axios": "^1.14.0",
     "better-sqlite3": "^12.8.0",
+    "chalk": "^5.6.2",
     "express": "^5.2.1",
+    "ffmpeg-static": "^5.3.0",
+    "koa": "^3.2.0",
+    "koa-bodyparser": "^4.4.1",
+    "koa-static": "^5.0.0",
     "NeteaseCloudMusicApi": "^4.30.0",
     "pino": "^10.3.1",
     "ts3-nodejs-library": "^3.5.1",