Secure cross-device connections for XSWD protocol

Connect web dApps to mobile XELIS wallets through a relay server with end-to-end encryption. Perfect for scenarios where direct WebSocket connections aren't possible (mobile, different networks, etc.).

• 🔒 End-to-end encryption - AES-256-GCM encryption (ChaCha20-Poly1305 coming soon)
• 📱 QR code-based pairing - Simple scan-to-connect workflow
• 🌐 Cross-device & cross-network - Works anywhere WebSocket does
• 🔌 Drop-in replacement - Use with existing XSWD clients
• 🛡️ Zero trust - Relay server never sees plaintext messages
• 🚀 Easy integration - As simple as WalletConnect

Built on top of xswd-relayer for secure peer-to-peer WebSocket tunneling.