Fix fetch binding issue in browser environments

Fixed error: "'fetch' called on an object that does not implement interface Window"

The fetch function reference was not properly bound to the global context.
Now using globalThis.fetch.bind(globalThis) to ensure correct binding.

Bumped version to 0.0.2

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

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "description": "TypeScript client for Rondevu peer signaling and discovery server",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",