Parse Flexoptix API compat entries (compatible_to_vendor + original_part_number)
and batch-upsert into flexoptix_product_map during each catalog sync.
- Fix extractCompatibility() to recognise compatibleToVendor key from API
- Add batchUpsertProductMap(): 500-row batch INSERTs with ON CONFLICT update
- Add writeProductMapEntries() per product, called after price/stock writes
- Track mapWrites in FlexoptixSyncResult and log in completion message
First sync: 9254 upserts → 2903 unique rows, 95 vendors, 343 Flexoptix SKUs.
Example: CWDM-SFP10G-1330 (Cisco) → P.1696.10.D.I (EUR 150.77, SFP+ 10G).
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