- Installed Tesseract OCR via winget
- Added scripts/ocr_invoices.py to OCR all PDFs via PyMuPDF
- Updated extract_invoices.py to fall back to OCR text for scanned pages
- Fixed stock-code regex to match "qty + code" pairs only (avoids spurious
matches like bare TCT in invoice headers)
- Added merge step to combine multi-page proformas into single invoice records
- All 11 previously-missing codes now in PB:
JEITCS12, JEITCS18, JEITCS22, JEITCL22, JEITCL92,
JEICS17, JEICS19, JEICS27, JEICS30, JEICS34, JEICS14-P1
- Only JEITCS50 remains unlisted (genuinely never ordered)
PB now: 19 invoices, 158 stock codes, 281 line items
