docs(openapi): update GET /jobs with pagination and JobListResponse
Add page/page_size query parameters, change response from JobResponse[] to JobListResponse, add 400 error code. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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