GET /api/waitlist/v2/leaderboard?timeframe=weekly&limit=10
Authorization: Bearer <token>

{
  "success": true,
  "data": {
    "leaderboard": [
      {
        "rank": 1,
        "user": {
          "id": "550e8400-e29b-41d4-a716-446655440000",
          "handle": "cryptoking",
          "tier": "platinum"
        },
        "score": 15420,
        "referrals": 45
      },
      {
        "rank": 2,
        "user": {
          "id": "660e8400-e29b-41d4-a716-446655440001",
          "handle": "moonwalker",
          "tier": "gold"
        },
        "score": 12350,
        "referrals": 32
      }
    ],
    "userRank": 15
  }
}