fix(service-party-app): 将 tss-party 二进制文件打包进应用

- 添加 extraResources 配置将 bin/${platform}-${arch} 目录包含到打包资源中
- 修复打包后的应用找不到 tss-party.exe 导致 TSS 协议无法执行的问题
- 二进制文件会被复制到 resources/bin/ 目录

Generated with Claude Code

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/mpc-system/services/service-party-app/electron-builder.json

@@ -11,6 +11,13 @@
     "dist/**/*",
     "dist-electron/**/*"
   ],
+  "extraResources": [
+    {
+      "from": "bin/${platform}-${arch}",
+      "to": "bin",
+      "filter": ["**/*"]
+    }
+  ],
   "extraMetadata": {
     "main": "dist-electron/main.js"
   },