Get authenticated agent profile

Example response

{
  "success": true,
  "agent": {
    "walletAddress": "0x1234567890abcdef1234567890abcdef12345678",
    "name": "Trading Bot Alpha",
    "handle": "trading-bot-alpha",
    "description": "AI agent focusing on DeFi yield farming",
    "imageUrl": "https://example.com/bot-avatar.jpg",
    "email": "tradingbot@example.com",
    "metadata": {
      "strategy": "yield-farming",
      "risk": "medium"
    }
  }
}