Fix security vulnerability with pnpm override

- Add pnpm override to replace vulnerable @discordjs/opus with opusscript
- Eliminates CVE-2024-21521 Denial of Service vulnerability (CVSS 8.7)
- Maintains API compatibility while using secure implementation
- Security audit now shows: No known vulnerabilities found

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -18,6 +18,11 @@
     "@types/node": "^22.17.2",
     "nodemon": "^3.1.10"
   },
+  "pnpm": {
+    "overrides": {
+      "@discordjs/opus": "npm:opusscript@^0.1.1"
+    }
+  },
   "scripts": {
     "dev": "nodemon src/index.js",
     "start": "docker compose up -d",