Rename RondevuClient to RondevuAPI and integrate into Rondevu class

- Renamed RondevuClient class to RondevuAPI for clarity
- Integrated API as public property `api` on Rondevu class
- Updated all internal references from `client` to `api`
- Updated all example code in documentation
- Removed recursive publish script from package.json
- Bumped version to 0.2.1

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

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

src/connection.ts

@@ -1,5 +1,5 @@
 import { EventEmitter } from './event-emitter';
-import { RondevuClient } from './client';
+import { RondevuAPI } from './client';
 import { RondevuConnectionParams } from './types';
 
 /**
@@ -12,7 +12,7 @@ export class RondevuConnection extends EventEmitter {
   readonly remotePeerId: string;
 
   private pc: RTCPeerConnection;
-  private client: RondevuClient;
+  private client: RondevuAPI;
   private localPeerId: string;
   private dataChannels: Map<string, RTCDataChannel>;
   private pollingInterval?: ReturnType<typeof setInterval>;
@@ -22,7 +22,7 @@ export class RondevuConnection extends EventEmitter {
   private isPolling: boolean = false;
   private isClosed: boolean = false;
 
-  constructor(params: RondevuConnectionParams, client: RondevuClient) {
+  constructor(params: RondevuConnectionParams, client: RondevuAPI) {
     super();
     this.id = params.id;
     this.topic = params.topic;