fix(sync): push stock immediately on new product creation

ProductSyncService now calls pushInitialStock() after creating a new
product in PrestaShop, so stock is correct without waiting for the next
StockSyncService run. Failures are caught and logged as warnings — the
product mapping is saved as SYNCED regardless, and StockSyncService will
correct any discrepancy on its next scheduled run.

Also applies the PS 8.2.5 false-instead-of-empty-array workaround to
getStockAvailableForProduct(), consistent with getProductByReference().

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/integration/prestashop/PrestashopClient.java

@@ -156,6 +156,7 @@ public class PrestashopClient {
      * @param productId PrestaShop product internal ID
      */
     public Optional<PrestashopStockAvailableDto> getStockAvailableForProduct(Integer productId) {
+        try {
             PrestashopStockAvailableDto.ListResponse response = restClient.get()
                     .uri(u -> u.path("/stock_availables")
                             .queryParam("ws_key", wsKey)
@@ -171,6 +172,14 @@ public class PrestashopClient {
                 return Optional.empty();
             }
             return Optional.of(response.stockAvailables().get(0));
+        } catch (PrestashopApiException e) {
+            if (e.getStatusCode() != null && e.getStatusCode().value() == 404) return Optional.empty();
+            throw e;
+        } catch (HttpMessageConversionException | RestClientException e) {
+            // PS 8.x returns {"stock_availables": false} instead of [] when filter has no results
+            log.debug("PS returned unparseable body for stock_available productId={}, treating as not found: {}", productId, e.getMessage());
+            return Optional.empty();
+        }
     }
 
     /** Updates the stock quantity for a stock_available record. */

sync-service/src/main/java/com/teterialosjuanjos/tfg/sync_service/sync/ProductSyncService.java

@@ -6,6 +6,7 @@ import com.teterialosjuanjos.tfg.sync_service.integration.dolibarr.dto.DolibarrP
 import com.teterialosjuanjos.tfg.sync_service.integration.dolibarr.exception.DolibarrApiException;
 import com.teterialosjuanjos.tfg.sync_service.integration.prestashop.PrestashopClient;
 import com.teterialosjuanjos.tfg.sync_service.integration.prestashop.dto.PrestashopProductDto;
+import com.teterialosjuanjos.tfg.sync_service.integration.prestashop.dto.PrestashopStockAvailableDto;
 import com.teterialosjuanjos.tfg.sync_service.integration.prestashop.exception.PrestashopApiException;
 import com.teterialosjuanjos.tfg.sync_service.mapping.*;
 import lombok.RequiredArgsConstructor;
@@ -110,10 +111,37 @@ public class ProductSyncService {
                         "Product created in PS but not found via GET (reference=" + sku + ")");
             }
             upsertMapping(sku, dolProduct.id(), created.id());
+            pushInitialStock(dolProduct, created.id(), sku);
             log.debug("ProductSync: created PS product reference={} id={}", sku, created.id());
         }
     }
 
+    /**
+     * Pushes Dolibarr stock to the PS stock_available record immediately after product creation.
+     * Skipped when stockReel is null or zero (PS default is already 0).
+     * Failures are logged as warnings but do not abort the product sync — StockSyncService
+     * will correct any discrepancy on its next run.
+     */
+    private void pushInitialStock(DolibarrProductDto dolProduct, Integer psProductId, String sku) {
+        if (dolProduct.stockReel() == null || dolProduct.stockReel() == 0) return;
+        int qty = dolProduct.stockReel().intValue();
+        try {
+            Optional<PrestashopStockAvailableDto> stockOpt =
+                    prestashopClient.getStockAvailableForProduct(psProductId);
+            if (stockOpt.isEmpty()) {
+                log.warn("ProductSync: no stock_available found for new product SKU={}, stock will sync on next StockSync run", sku);
+                return;
+            }
+            PrestashopStockAvailableDto current = stockOpt.get();
+            prestashopClient.updateStockAvailable(current.id(),
+                    new PrestashopStockAvailableDto(current.id(), current.idProduct(),
+                            current.idProductAttribute(), String.valueOf(qty)));
+            log.debug("ProductSync: initial stock pushed SKU={} qty={}", sku, qty);
+        } catch (PrestashopApiException | RestClientException | HttpMessageConversionException e) {
+            log.warn("ProductSync: could not push initial stock for SKU={}: {}", sku, e.getMessage());
+        }
+    }
+
     private void upsertMapping(String sku, Integer dolibarrId, Integer prestashopId) {
         ProductMapping mapping = productMappingRepository.findBySku(sku)
                 .orElseGet(() -> ProductMapping.builder().sku(sku).build());