Add product weather effects and regional pricing enhancements

- Introduced a new endpoint in FalukantController to retrieve product prices based on region and product ID.
- Implemented logic in FalukantService to calculate product prices considering user knowledge and regional factors.
- Added weather-related data models and associations to enhance product pricing accuracy based on weather conditions.
- Updated frontend components to cache and display regional product prices effectively, improving user experience.

backend/controllers/falukantController.js

@@ -144,6 +144,14 @@ class FalukantController {
         this.applyForElections = this._wrapWithUser((userId, req) => this.service.applyForElections(userId, req.body.electionIds));
 
         this.getRegions = this._wrapWithUser((userId) => this.service.getRegions(userId));
+        this.getProductPriceInRegion = this._wrapWithUser((userId, req) => {
+            const productId = parseInt(req.query.productId, 10);
+            const regionId = parseInt(req.query.regionId, 10);
+            if (Number.isNaN(productId) || Number.isNaN(regionId)) {
+                throw new Error('productId and regionId are required');
+            }
+            return this.service.getProductPriceInRegion(userId, productId, regionId);
+        });
         this.getProductPricesInCities = this._wrapWithUser((userId, req) => {
             const productId = parseInt(req.query.productId, 10);
             const currentPrice = parseFloat(req.query.currentPrice);