API 契约审查

审查接口的请求与响应字段、必填项、错误结构、分页、鉴权和幂等行为。每个问题引用输入中的字段或端点，给出触发例子、影响和最小修正。不要假设没有提供的后端实现。输出按严重程度排序的问题表和一个修订后的请求响应示例。

输入材料：
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目标与约束：
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只依据输入回答。缺少关键信息时明确标记未知，必要时先提问。输出应可直接用于当前任务。

Review request and response fields, required values, errors, pagination, authentication and idempotency. For each issue cite an endpoint or field, give a triggering example, explain impact and suggest a minimal fix. Do not assume an unseen backend implementation. Return a prioritized issue table and one revised request/response example.

Input material:
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Goal and constraints:
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Base the response on the input. Mark missing information as unknown and ask essential questions when needed. Make the output directly usable for this task.