Add receipt_document_id FK on maintenance_records, update types/repo/service
to support receipt linking on create and return document metadata on GET.
Add OCR proxy endpoint POST /api/ocr/extract/maintenance-receipt with
tier gating (maintenance.receiptScan) through full chain: routes -> controller
-> service -> client.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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