获取健身偏好

{
    "code": 200,
    "message": "success",
    "data": {
        "id": 1,
        "user_id": 1,
        "fitness_goals": [
            "减脂",
            "增肌"
        ],
        "preferred_categories": [
            1,
            3
        ],
        "preferred_time_slots": [
            "weekday_morning"
        ],
        "frequency_per_week": 3,
        "health_limitations": "膝盖受伤，请避免高强度跳跃",
        "favorite_coach_ids": [
            2,
            5
        ],
        "updated_at": "2024-01-10T10:00:00Z"
    }
}