httpCallBack 通道 adapter：提供 Servlet 端点五步流水线（读 body → 验签 → parse → dispatch → ack），
接收开放平台 httpCallBack 推送并转为 newton-openapi-sdk 核心的 TaskNotification。
独立 Maven 工程，与 sdk-core 平级；依赖方向单向：adapter → sdk-core。
多 pod 生产 ISV 主推通道。
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