Remove origin bucketing feature

- Remove origin option from client configuration
- Simplify API client to not send Origin header
- Version 0.3.4

Origin-based session isolation has been removed from the server,
so this feature is no longer needed on the client side.

🤖 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": "0.3.3",
+  "version": "0.3.4",
   "description": "TypeScript client for Rondevu peer signaling and discovery server",
   "type": "module",
   "main": "dist/index.js",