GET /api/gamification/profile

{
  "badges": [
    {
      "id": "first_agent",
      "name": "Agent Creator",
      "description": "Create your first AI agent",
      "icon": "🤖",
      "category": "onboarding",
      "points": 50,
      "condition": "Create 1 agent"
    }
  ],
  "points": 150,
  "level": 2,
  "title": "Beginner",
  "nextLevel": 500,
  "progress": 30,
  "streak": 3,
  "badgeAwarded": null,
  "leaderboard": [
    {
      "userId": "user_abc",
      "name": "Alice",
      "points": 2500,
      "level": 5,
      "title": "Expert"
    }
  ],
  "userRank": 4,
  "availableBadges": [
    {
      "id": "message_100",
      "name": "Century Club",
      "description": "Send 100 messages through your agents",
      "icon": "💬",
      "category": "usage",
      "points": 100,
      "condition": "100 messages"
    }
  ]
}