fix: add types field to package.json for TypeScript consumers

Without an explicit types entry, CRA's compiler couldn't resolve
declaration files from the dist/ directory via the npm link symlink.

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

Author: smoghe-bw

package.json

@@ -3,6 +3,7 @@
   "version": "0.0.1",
   "description": "SDK for BandwidthRTC Node Applications",
   "main": "dist/index.js",
+  "types": "dist/index.d.ts",
   "scripts": {
     "build": "rm -rf ./dist/* && prettier --check  . && tsc && webpack --config webpack.prod.js",
     "build:dev": "rm -rf ./dist/* && prettier --check  . && tsc && webpack --config webpack.dev.js",