Adds the 5 pricing columns surfaced by the per-berth PDFs (Phase 6b
will populate them via the OCR parser) and the last_imported_at marker
the NocoDB import script (Phase 0c) uses to detect human edits and
skip overwriting them.
- weekly_rate_high_usd / weekly_rate_low_usd
- daily_rate_high_usd / daily_rate_low_usd
- pricing_valid_until (date) - drives the "stale pricing" chip on
the berth detail page when older than today
- last_imported_at - compared against updated_at so re-running the
import preserves CRM-side overrides
tenure_type comment widens to include 'fee_simple' and 'strata_lot'
to match the per-berth PDF tenure model; the column is plain text
so no DB-level enum change is required.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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