Historical passenger-flow backfill

Recover pre-2026-09-03 HikCentral hourly passenger flow into reviewed, source-attributed history for statistics, never for calibration. Umbrella: #160. Spec: docs/architecture/rfc-historical-flow-backfill.md. Includes the prerequisites #108, #113, #114 and #161 that monthly curation (#163) builds on, and the admin tab cleanup (#173) that makes room for the import menu. Also required: #186 (business-day audit actions and FREEZE on existing databases, which imports write through) and #246 (backfilled days have no frozen record, so holiday readers must agree without one).

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52% Completed
fix(occupancy): address holiday stamping follow-ups
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#267 opened 2026-10-03 12:30:26 +00:00 by gabogg 5 / 5 1 conflicting file
feat(schedule): complete schedule follow-ups
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#228 opened 2026-10-03 07:21:28 +00:00 by gabogg 4 / 5 3 conflicting files
feat(occupancy): curate monthly historical flow drafts
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#170 opened 2026-09-28 09:00:59 +00:00 by gabogg