zhi 570cfee5cd BE-CAL-006: implement Calendar overlap detection service ...

- New overlap.py service with check_overlap(), check_overlap_for_create(),
  and check_overlap_for_edit() functions
- Detects same-day time conflicts for a user's calendar
- Checks both real (materialized) TimeSlots and virtual (plan-generated) slots
- Excludes skipped/aborted slots from conflict checks
- Edit scenario excludes the slot being edited from conflict candidates
- Returns structured SlotConflict objects with human-readable messages
- 24 passing tests covering no-conflict, conflict detection, inactive
  exclusion, edit self-exclusion, virtual slot overlap, and message content

2026-03-31 01:17:54 +00:00

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