This commit adds the full end-to-end SKU pricing match flow for quote items:
- Add new QuoteItem and PriceListRow fields for SKU and pricing metadata
- Add sku_normalised to price_list for robust format-agnostic SKU matching
- Refactor price list search to use modular search builder and filter helpers
- Add database migrations, backfill scripts, and new package commands
- Update catalogue search UI and fix quote list accidental click behavior
- Add comprehensive unit, smoke, and end-to-end test suites
- Update documentation for the new price search and extraction logic
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