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/database-scripts/09_articole_terti_050.sql

@@ -0,0 +1,54 @@
+-- ====================================================================
+-- 09_articole_terti_050.sql
+-- Mapări ARTICOLE_TERTI cu cantitate_roa = 0.5 pentru articole
+-- unde unitatea web (50 buc/set) ≠ unitatea ROA (100 buc/set).
+--
+-- Efect: price sync va calcula pret_crm = pret_web / 0.5,
+--   iar kit pricing va folosi prețul corect per set ROA.
+--
+-- 25.03.2026 - creat pentru fix discount negativ kit pahare
+-- ====================================================================
+
+-- Pahar 6oz Coffee Coffee SIBA 50buc (GoMag) → 100buc/set (ROA)
+INSERT INTO articole_terti (sku, codmat, cantitate_roa, activ, sters, data_creare, id_util_creare)
+SELECT '1708828', '1708828', 0.5, 1, 0, SYSDATE, -3 FROM dual
+WHERE NOT EXISTS (
+  SELECT 1 FROM articole_terti WHERE sku = '1708828' AND codmat = '1708828' AND sters = 0
+);
+
+-- Pahar 8oz Coffee Coffee SIBA 50buc → 100buc/set
+INSERT INTO articole_terti (sku, codmat, cantitate_roa, activ, sters, data_creare, id_util_creare)
+SELECT '528795', '528795', 0.5, 1, 0, SYSDATE, -3 FROM dual
+WHERE NOT EXISTS (
+  SELECT 1 FROM articole_terti WHERE sku = '528795' AND codmat = '528795' AND sters = 0
+);
+
+-- Pahar 8oz Tchibo 50buc → 100buc/set
+INSERT INTO articole_terti (sku, codmat, cantitate_roa, activ, sters, data_creare, id_util_creare)
+SELECT '58', '58', 0.5, 1, 0, SYSDATE, -3 FROM dual
+WHERE NOT EXISTS (
+  SELECT 1 FROM articole_terti WHERE sku = '58' AND codmat = '58' AND sters = 0
+);
+
+-- Pahar 7oz Lavazza SIBA 50buc → 100buc/set
+INSERT INTO articole_terti (sku, codmat, cantitate_roa, activ, sters, data_creare, id_util_creare)
+SELECT '51', '51', 0.5, 1, 0, SYSDATE, -3 FROM dual
+WHERE NOT EXISTS (
+  SELECT 1 FROM articole_terti WHERE sku = '51' AND codmat = '51' AND sters = 0
+);
+
+-- Pahar 8oz Albastru JND 50buc → 100buc/set
+INSERT INTO articole_terti (sku, codmat, cantitate_roa, activ, sters, data_creare, id_util_creare)
+SELECT '105712338826', '105712338826', 0.5, 1, 0, SYSDATE, -3 FROM dual
+WHERE NOT EXISTS (
+  SELECT 1 FROM articole_terti WHERE sku = '105712338826' AND codmat = '105712338826' AND sters = 0
+);
+
+-- Pahar 8oz Paris JND 50buc → 100buc/set
+INSERT INTO articole_terti (sku, codmat, cantitate_roa, activ, sters, data_creare, id_util_creare)
+SELECT '10573080', '10573080', 0.5, 1, 0, SYSDATE, -3 FROM dual
+WHERE NOT EXISTS (
+  SELECT 1 FROM articole_terti WHERE sku = '10573080' AND codmat = '10573080' AND sters = 0
+);
+
+COMMIT;