fix(import): resolve correct id_articol for duplicate CODMATs + gestiune setting

Unified id_articol selection logic in Python (resolve_codmat_ids) and PL/SQL
(resolve_id_articol): filters sters=0 AND inactiv=0, prefers article with
stock in configured gestiune, falls back to MAX(id_articol). Eliminates
mismatch where Python and PL/SQL could pick different id_articol for the
same CODMAT, causing ORA-20000 price-not-found errors.

- Add resolve_codmat_ids helper in validation_service.py (single batch query)
- Refactor validate_skus/validate_prices/ensure_prices to use it
- Add resolve_id_articol function in PL/SQL package body
- Add p_id_gestiune parameter to importa_comanda (spec + body)
- Add /api/settings/gestiuni endpoint and id_gestiune setting
- Add gestiune dropdown in settings UI

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

api/app/routers/sync.py

@@ -33,6 +33,7 @@ class AppSettingsUpdate(BaseModel):
     discount_id_pol: str = ""
     id_pol: str = ""
     id_sectie: str = ""
+    id_gestiune: str = ""
     gomag_api_key: str = ""
     gomag_api_shop: str = ""
     gomag_order_days_back: str = "7"
@@ -597,6 +598,7 @@ async def get_app_settings():
         "discount_id_pol": s.get("discount_id_pol", ""),
         "id_pol": s.get("id_pol", ""),
         "id_sectie": s.get("id_sectie", ""),
+        "id_gestiune": s.get("id_gestiune", ""),
         "gomag_api_key": s.get("gomag_api_key", "") or config_settings.GOMAG_API_KEY,
         "gomag_api_shop": s.get("gomag_api_shop", "") or config_settings.GOMAG_API_SHOP,
         "gomag_order_days_back": s.get("gomag_order_days_back", "") or str(config_settings.GOMAG_ORDER_DAYS_BACK),
@@ -616,6 +618,7 @@ async def update_app_settings(config: AppSettingsUpdate):
     await sqlite_service.set_app_setting("discount_id_pol", config.discount_id_pol)
     await sqlite_service.set_app_setting("id_pol", config.id_pol)
     await sqlite_service.set_app_setting("id_sectie", config.id_sectie)
+    await sqlite_service.set_app_setting("id_gestiune", config.id_gestiune)
     await sqlite_service.set_app_setting("gomag_api_key", config.gomag_api_key)
     await sqlite_service.set_app_setting("gomag_api_shop", config.gomag_api_shop)
     await sqlite_service.set_app_setting("gomag_order_days_back", config.gomag_order_days_back)
@@ -624,6 +627,26 @@ async def update_app_settings(config: AppSettingsUpdate):
     return {"success": True}
 
 
+@router.get("/api/settings/gestiuni")
+async def get_gestiuni():
+    """Get list of warehouses from Oracle for dropdown."""
+    def _query():
+        conn = database.get_oracle_connection()
+        try:
+            with conn.cursor() as cur:
+                cur.execute(
+                    "SELECT id_gestiune, nume_gestiune FROM nom_gestiuni WHERE sters=0 AND inactiv=0 ORDER BY id_gestiune"
+                )
+                return [{"id": str(row[0]), "label": f"{row[0]} - {row[1]}"} for row in cur]
+        finally:
+            database.pool.release(conn)
+    try:
+        return await asyncio.to_thread(_query)
+    except Exception as e:
+        logger.error(f"get_gestiuni error: {e}")
+        return []
+
+
 @router.get("/api/settings/sectii")
 async def get_sectii():
     """Get list of sections from Oracle for dropdown."""