{
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  "contentType": "application/json",
  "userAgent": "zhinian-aigc-webhook/1.0",
  "signatureHeader": "X-Zhinian-Signature",
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    "capability": "image.generate",
    "outputAssetIds": [],
    "error": { "message": "provider unavailable", "retryable": true },
    "updatedAt": "2026-08-13T08:00:00.000Z"
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