Add ServiceHost, ServiceClient, and RondevuService for high-level service management

- Add RondevuService: High-level API for username claiming and service publishing with Ed25519 signatures
- Add ServiceHost: Manages offer pool for hosting services with auto-replacement
- Add ServiceClient: Connects to hosted services with automatic reconnection
- Add NoOpSignaler: Placeholder signaler for connection setup
- Integrate Ed25519 signature functionality from @noble/ed25519
- Add ESLint and Prettier configuration with 4-space indentation
- Add demo with local signaling test
- Version bump to 0.10.0

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

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

vite.config.js

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+    root: 'demo',
+    server: {
+        port: 3000,
+        open: true,
+        allowedHosts: ['241284034b20.ngrok-free.app']
+    }
+});