Type Alias ApiError

Error response shape shared by multiple operations.

Status vs body:

• Many handlers return { error: ... } without success: false.
• Some handlers include a status field in the JSON body (e.g. DUPLICATE_USER uses status: 409) without necessarily setting the HTTP status code.
• Other handlers set real HTTP statuses (e.g. UNAUTHORIZED uses HTTP 401; SERVER_ERROR may use HTTP 500).