Enhance product price retrieval by including currentRegionId in FalukantController and FalukantService

- Updated the FalukantController to accept currentRegionId as a parameter for fetching product prices in cities.
- Modified the FalukantService to incorporate currentRegionId in the price calculation logic, allowing exclusion of the current region from results.
- Adjusted frontend components to pass currentRegionId, improving the accuracy of price comparisons and user experience.

frontend/src/views/falukant/BranchView.vue

@@ -49,6 +49,7 @@
                         :products="products"
                         :calculateProductRevenue="calculateProductRevenue"
                         :calculateProductProfit="calculateProductProfit"
+                        :currentRegionId="selectedBranch?.regionId"
                         ref="revenueSection"
                     />
                 </div>