Add product price retrieval feature in cities

- Implemented a new endpoint in FalukantController to fetch product prices in various cities based on product ID and current price.
- Developed the corresponding service method in FalukantService to calculate and return prices, considering user knowledge and city branches.
- Updated frontend components (RevenueSection and SaleSection) to display better prices for products, including loading logic and UI enhancements for price visibility.
- Added styling for price indicators based on branch types to improve user experience.

frontend/src/components/falukant/RevenueSection.vue

@@ -16,6 +16,7 @@
               <th>{{ $t('falukant.branch.revenue.perMinute') }}</th>
               <th>{{ $t('falukant.branch.revenue.profitAbsolute') }}</th>
               <th>{{ $t('falukant.branch.revenue.profitPerMinute') }}</th>
+              <th>Bessere Preise</th>
             </tr>
           </thead>
           <tbody>
@@ -26,6 +27,16 @@
               <td>{{ calculateProductRevenue(product).perMinute }}</td>
               <td>{{ calculateProductProfit(product).absolute }}</td>
               <td>{{ calculateProductProfit(product).perMinute }}</td>
+              <td>
+                <div v-if="product.betterPrices && product.betterPrices.length > 0" class="price-cities">
+                  <span v-for="city in product.betterPrices" :key="city.regionId" 
+                        :class="['city-price', getCityPriceClass(city.branchType)]"
+                        :title="`${city.regionName}: ${formatPrice(city.price)}`">
+                    {{ city.regionName }}
+                  </span>
+                </div>
+                <span v-else class="no-better-prices">—</span>
+              </td>
             </tr>
           </tbody>
         </table>
@@ -34,6 +45,8 @@
   </template>
   
   <script>
+  import apiClient from '@/utils/axios.js';
+
   export default {
     name: "RevenueSection",
     props: {
@@ -44,6 +57,7 @@
     data() {
       return {
         isRevenueTableOpen: false,
+        loadingPrices: new Set(),
       };
     },
     computed: {
@@ -56,9 +70,64 @@
         }, null);
       },
     },
+    async mounted() {
+      if (this.isRevenueTableOpen) {
+        await this.loadPricesForAllProducts();
+      }
+    },
+    watch: {
+      isRevenueTableOpen(newVal) {
+        if (newVal) {
+          this.loadPricesForAllProducts();
+        }
+      },
+      products: {
+        handler() {
+          if (this.isRevenueTableOpen) {
+            this.loadPricesForAllProducts();
+          }
+        },
+        deep: true
+      }
+    },
     methods: {
       toggleRevenueTable() {
         this.isRevenueTableOpen = !this.isRevenueTableOpen;
+        if (this.isRevenueTableOpen) {
+          this.loadPricesForAllProducts();
+        }
+      },
+      async loadPricesForAllProducts() {
+        for (const product of this.products) {
+          if (this.loadingPrices.has(product.id)) continue;
+          this.loadingPrices.add(product.id);
+          try {
+            const currentPrice = parseFloat(this.calculateProductRevenue(product).absolute);
+            const { data } = await apiClient.get('/api/falukant/products/prices-in-cities', {
+              params: {
+                productId: product.id,
+                currentPrice: currentPrice
+              }
+            });
+            this.$set(product, 'betterPrices', data || []);
+          } catch (error) {
+            console.error(`Error loading prices for product ${product.id}:`, error);
+            this.$set(product, 'betterPrices', []);
+          } finally {
+            this.loadingPrices.delete(product.id);
+          }
+        }
+      },
+      getCityPriceClass(branchType) {
+        if (branchType === 'store') return 'city-price-green';
+        if (branchType === 'production') return 'city-price-orange';
+        return 'city-price-red';
+      },
+      formatPrice(price) {
+        return new Intl.NumberFormat(navigator.language, {
+          minimumFractionDigits: 2,
+          maximumFractionDigits: 2,
+        }).format(price);
       },
     },
   };
@@ -94,5 +163,32 @@
   .highlight {
     background-color: #dfffd6;
   }
+  .price-cities {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.3em;
+  }
+  .city-price {
+    padding: 0.2em 0.4em;
+    border-radius: 3px;
+    font-size: 0.85em;
+    cursor: help;
+  }
+  .city-price-green {
+    background-color: #90EE90;
+    color: #000;
+  }
+  .city-price-orange {
+    background-color: #FFA500;
+    color: #000;
+  }
+  .city-price-red {
+    background-color: #FF6B6B;
+    color: #fff;
+  }
+  .no-better-prices {
+    color: #999;
+    font-style: italic;
+  }
   </style>