fix(sync): prevent kit/bax price sync from overwriting individual CRM prices

Three code paths could overwrite CRM list prices with wrong values when
web unit (50 buc) differs from ROA unit (100 buc):

- price_sync_service: kit path now skips components that have their own
  ARTICOLE_TERTI mapping (individual path handles them with correct ÷0.5)
- validation_service: sync_prices_from_order now skips bax SKUs
  (cantitate_roa > 1) in addition to multi-component kits
- pack_import_comenzi: skip negative kit discount (markup), ROUND prices
  to nzecimale_pretv decimals

Also adds:
- SQL script for 6 ARTICOLE_TERTI mappings (cantitate_roa=0.5) for cup
  articles where web=50buc, ROA=100buc/set
- Oracle schema reference documentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/services/price_sync_service.py

@@ -154,6 +154,12 @@ async def run_catalog_price_sync(run_id: str):
                         if is_kit:
                             for comp in mapped_data[sku]:
                                 comp_codmat = comp["codmat"]
+
+                                # Skip components that have their own ARTICOLE_TERTI mapping
+                                # (they'll be synced with correct cantitate_roa in individual path)
+                                if comp_codmat in mapped_data:
+                                    continue
+
                                 comp_product = products_by_sku.get(comp_codmat)
                                 if not comp_product:
                                     continue  # Component not in GoMag as standalone product