REST API endpoints for cost data and forecasts

POST /api/v1/costs/sync
Authorization: Bearer <token>

{
  "job_id": 55,
  "status": "running"
}

GET /api/v1/costs/overview
Authorization: Bearer <token>

{
  "current_month": {
    "amount": 4231.50,
    "currency": "USD",
    "from": "2024-01-01",
    "to": "2024-01-14"
  },
  "last_month": {
    "amount": 8450.00,
    "currency": "USD"
  },
  "mom_change_percent": -8.2,
  "by_provider": [
    { "provider_id": 1, "name": "AWS Production", "amount": 3800.00 },
    { "provider_id": 2, "name": "GCP Production", "amount": 431.50 }
  ]
}

GET /api/v1/costs/trend
Authorization: Bearer <token>

{
  "data": [
    {
      "date": "2024-01-14",
      "amount": 285.40,
      "breakdown": {
        "EC2": 180.00,
        "S3": 45.00,
        "RDS": 60.40
      }
    }
  ]
}

GET /api/v1/costs/forecast
Authorization: Bearer <token>

{
  "forecast_days": 30,
  "projected_total": 8750.00,
  "confidence_interval": {
    "low": 7900.00,
    "high": 9600.00
  },
  "daily": [
    {
      "date": "2024-01-15",
      "amount": 291.67,
      "lower": 260.00,
      "upper": 320.00
    }
  ]
}

GET /api/v1/costs/anomalies
Authorization: Bearer <token>

POST /api/v1/costs/anomalies/{id}/dismiss
Authorization: Bearer <token>
Content-Type: application/json

{
  "reason": "Planned migration"
}