Get message reports (paginated)

Example response

{
  "items": [
    {
      "id": 1,
      "userId": "user-uuid",
      "reasonId": "too_expensive",
      "additionalDetails": "This content violates guidelines",
      "createdAt": "2024-01-15T10:30:00Z",
      "type": "model",
      "targetId": "content-uuid"
    }
  ],
  "page": 1,
  "limit": 20,
  "total": 150
}