Test du handler CosyHosting
============================
Réponse: {
    "success": true,
    "timestamp": "2025-12-16 11:36:15",
    "execution_time": 0.010185956954956055,
    "data": {
        "reservations": [],
        "ignored_reservations": [],
        "total_count": 0,
        "valid_count": 0,
        "ignored_count": 0,
        "periode": {
            "date_debut": "2025-01-01",
            "date_fin": "2025-01-31"
        },
        "bien_id": null,
        "sources": [
            "guesty"
        ],
        "errors": []
    }
}