zhi a5b885e8b5 BE-CAL-005: Implement plan virtual-slot identification and materialization ...

- New service: app/services/plan_slot.py
  - Virtual slot ID: plan-{plan_id}-{YYYY-MM-DD} format with parse/make helpers
  - Plan-date matching: on_month/on_week/on_day hierarchy with week_of_month calc
  - Materialization: convert virtual slot to real TimeSlot row from plan template
  - Detach: clear plan_id after edit/cancel to break plan association
  - Bulk materialization: materialize_all_for_date for daily pre-compute
- New tests: tests/test_plan_slot.py (23 tests, all passing)

2026-03-30 23:47:07 +00:00

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