feat(falukant): add transport cost option to product price calculations

- Updated the `getProductPricesInCitiesBatch` method in FalukantService to accept an options parameter for including transport costs in price calculations.
- Modified the tax calculation logic to conditionally apply transport costs based on the new parameter, enhancing the accuracy of pricing based on regional differences.
- Adjusted the FalukantController to pass the includeTransportCosts option from the request body, improving flexibility in pricing queries.

backend/services/falukantService.js

@@ -7079,8 +7079,9 @@ class FalukantService extends BaseService {
      * @param {number|null} currentRegionId
      * @returns {Promise<Record<number, Array<{ regionId, regionName, price, branchType }>>>}
      */
-    async getProductPricesInCitiesBatch(hashedUserId, items, currentRegionId = null) {
+    async getProductPricesInCitiesBatch(hashedUserId, items, currentRegionId = null, options = {}) {
         if (!items || items.length === 0) return {};
+        const includeTransportCosts = Boolean(options?.includeTransportCosts);
         const productIds = [...new Set(items.map(i => i.productId))];
         const priceByProduct = new Map(items.map(i => [i.productId, i.currentPrice]));
 
@@ -7189,7 +7190,9 @@ ORDER BY r.id`,
                 const grossPrice = calcRegionalSellPriceSync(product, knowledgeFactor, worthPercent);
                 if (grossPrice == null) continue;
                 const taxPercent = Number(taxByCity.get(city.id) || 0);
-                const transportPerPiece = currentRegionId && city.id !== currentRegionId ? (grossPrice * 0.01) : 0;
+                const transportPerPiece = includeTransportCosts && currentRegionId && city.id !== currentRegionId
+                    ? (grossPrice * 0.01)
+                    : 0;
                 const taxableProfit = Math.max(0, grossPrice - pieceCost - transportPerPiece);
                 const taxPerPiece = taxableProfit * (taxPercent / 100);
                 const netPerPiece = grossPrice - pieceCost - taxPerPiece - transportPerPiece;