Fix EventEmitter for cross-platform compatibility (v0.18.3)

Replace Node.js 'events' module with 'eventemitter3' package
to ensure compatibility in both browser and Node.js environments.

Changes:
- Replace import from 'events' to 'eventemitter3'
- Add eventemitter3 as dependency
- Remove @types/node (no longer needed)

Fixes browser bundling error where 'events' module was not available.

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

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

src/rondevu.ts

@@ -1,6 +1,6 @@
 import { RondevuAPI, Keypair, IceCandidate, BatcherOptions } from './api.js'
 import { CryptoAdapter } from './crypto-adapter.js'
-import { EventEmitter } from 'events'
+import { EventEmitter } from 'eventemitter3'
 
 // ICE server preset names
 export type IceServerPreset = 'ipv4-turn' | 'hostname-turns' | 'google-stun' | 'relay-only'