Align service-record PDF/DOCX generation with task-level data and naming.
- Use Task.service_report_note as report note source
- Use Task.scheduled_date for service-record dates
- Rename per-task exports to MT...SN... format
- Add monthly SN/PN ZIP download endpoints with 7-day retention
- Add calendar 'Preuzmi sve' modal with both bulk download actions
- Prefill work-hours day/date from scheduled_date for empty tables
- Remove duplicate note table and clean extra DOCX page breaks
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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