Honor print job copies

[PedroBMR]

Summary

• persist requested copy counts on queued print jobs and send payloads repeatedly per job
• add schema migration and data access changes to store the number of copies
• cover multiple-copy handling in the print queue tests

Testing

• pytest tests/db/test_print_jobs_queue.py

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid resending already printed copies after retry

Within each retry attempt all requested copies are sent in one loop; if target.send raises after printing some copies, the except block triggers a retry of the entire loop on the next attempt, causing more copies to be printed than requested whenever a transient failure happens mid‑batch. This overprints labels for multi‑copy jobs; consider tracking remaining copies or aborting without reissuing copies already sent.

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