feat: implement offer pooling for multi-connection services

- Add OfferPool class for managing multiple offers with auto-refill polling
- Add ServicePool class for orchestrating pooled connections and connection registry
- Modify exposeService() to support poolSize parameter (backward compatible)
- Add discovery API with service resolution and online status checking
- Add username claiming with Ed25519 signatures and TTL-based expiry
- Fix TypeScript import errors (RondevuPeer default export)
- Fix RondevuPeer instantiation to use RondevuOffers instance
- Fix peer.answer() calls to include required PeerOptions parameter
- Fix Ed25519 API call (randomSecretKey vs randomPrivateKey)
- Remove bloom filter (V1 legacy code)
- Update version to 0.8.0
- Document pooling feature and new APIs in README

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

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

src/rondevu.ts

@@ -1,5 +1,8 @@
 import { RondevuAuth, Credentials, FetchFunction } from './auth.js';
 import { RondevuOffers } from './offers.js';
+import { RondevuUsername } from './usernames.js';
+import { RondevuServices } from './services.js';
+import { RondevuDiscovery } from './discovery.js';
 import RondevuPeer from './peer/index.js';
 
 export interface RondevuOptions {
@@ -65,7 +68,11 @@ export interface RondevuOptions {
 
 export class Rondevu {
   readonly auth: RondevuAuth;
+  readonly usernames: RondevuUsername;
+
   private _offers?: RondevuOffers;
+  private _services?: RondevuServices;
+  private _discovery?: RondevuDiscovery;
   private credentials?: Credentials;
   private baseUrl: string;
   private fetchFn?: FetchFunction;
@@ -81,15 +88,19 @@ export class Rondevu {
     this.rtcIceCandidate = options.RTCIceCandidate;
 
     this.auth = new RondevuAuth(this.baseUrl, this.fetchFn);
+    this.usernames = new RondevuUsername(this.baseUrl);
 
     if (options.credentials) {
       this.credentials = options.credentials;
       this._offers = new RondevuOffers(this.baseUrl, this.credentials, this.fetchFn);
+      this._services = new RondevuServices(this.baseUrl, this.credentials);
+      this._discovery = new RondevuDiscovery(this.baseUrl, this.credentials);
     }
   }
 
   /**
-   * Get offers API (requires authentication)
+   * Get offers API (low-level access, requires authentication)
+   * For most use cases, use services and discovery APIs instead
    */
   get offers(): RondevuOffers {
     if (!this._offers) {
@@ -98,6 +109,26 @@ export class Rondevu {
     return this._offers;
   }
 
+  /**
+   * Get services API (requires authentication)
+   */
+  get services(): RondevuServices {
+    if (!this._services) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
+    }
+    return this._services;
+  }
+
+  /**
+   * Get discovery API (requires authentication)
+   */
+  get discovery(): RondevuDiscovery {
+    if (!this._discovery) {
+      throw new Error('Not authenticated. Call register() first or provide credentials.');
+    }
+    return this._discovery;
+  }
+
   /**
    * Register and initialize authenticated client
    * Generates a cryptographically random peer ID (128-bit)
@@ -105,12 +136,14 @@ export class Rondevu {
   async register(): Promise<Credentials> {
     this.credentials = await this.auth.register();
 
-    // Create offers API instance
+    // Create API instances
     this._offers = new RondevuOffers(
       this.baseUrl,
       this.credentials,
       this.fetchFn
     );
+    this._services = new RondevuServices(this.baseUrl, this.credentials);
+    this._discovery = new RondevuDiscovery(this.baseUrl, this.credentials);
 
     return this.credentials;
   }