Add price refresh functionality to configurator

- Add price_updated_at field to qt_configurations table to track when prices were last updated
- Add RefreshPrices() method in configuration service to update all component prices with current values from database
- Add POST /api/configs/:uuid/refresh-prices API endpoint for price updates
- Add "Refresh Prices" button in configurator UI next to Save button
- Display last price update timestamp in human-readable format (e.g., "5 min ago", "2 hours ago")
- Create migration 004_add_price_updated_at.sql for database schema update
- Update CLAUDE.md documentation with new API endpoint and schema changes
- Add MIGRATION_PRICE_REFRESH.md with detailed migration instructions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

web/templates/index.html

@@ -14,10 +14,14 @@
                 <span id="config-name">Конфигуратор</span>
             </h1>
         </div>
-        <div id="save-buttons" class="hidden space-x-2">
+        <div id="save-buttons" class="hidden flex items-center space-x-2">
+            <button onclick="refreshPrices()" class="px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700">
+                Пересчитать цену
+            </button>
             <button onclick="saveConfig()" class="px-4 py-2 bg-green-600 text-white rounded hover:bg-green-700">
                 Сохранить
             </button>
+            <span id="price-update-date" class="text-sm text-gray-500"></span>
         </div>
     </div>
 
@@ -315,6 +319,11 @@ document.addEventListener('DOMContentLoaded', async function() {
         if (config.custom_price) {
             document.getElementById('custom-price-input').value = config.custom_price.toFixed(2);
         }
+
+        // Display price update date if available
+        if (config.price_updated_at) {
+            updatePriceUpdateDate(config.price_updated_at);
+        }
     } catch(e) {
         showToast('Ошибка загрузки конфигурации', 'error');
         window.location.href = '/configs';
@@ -1298,6 +1307,86 @@ async function exportCSVWithCustomPrice() {
     }
 }
 
+async function refreshPrices() {
+    const token = localStorage.getItem('token');
+    if (!token || !configUUID) return;
+
+    try {
+        const resp = await fetch('/api/configs/' + configUUID + '/refresh-prices', {
+            method: 'POST',
+            headers: {
+                'Authorization': 'Bearer ' + token,
+                'Content-Type': 'application/json'
+            }
+        });
+
+        if (resp.status === 401) {
+            window.location.href = '/login';
+            return;
+        }
+
+        if (!resp.ok) {
+            showToast('Ошибка обновления цен', 'error');
+            return;
+        }
+
+        const config = await resp.json();
+
+        // Update cart with new prices
+        if (config.items && config.items.length > 0) {
+            cart = config.items.map(item => ({
+                lot_name: item.lot_name,
+                quantity: item.quantity,
+                unit_price: item.unit_price,
+                description: item.description || '',
+                category: item.category || getCategoryFromLotName(item.lot_name)
+            }));
+        }
+
+        // Update price update date
+        if (config.price_updated_at) {
+            updatePriceUpdateDate(config.price_updated_at);
+        }
+
+        // Re-render UI
+        renderTab();
+        updateCartUI();
+
+        showToast('Цены обновлены', 'success');
+    } catch(e) {
+        showToast('Ошибка обновления цен', 'error');
+    }
+}
+
+function updatePriceUpdateDate(dateStr) {
+    if (!dateStr) {
+        document.getElementById('price-update-date').textContent = '';
+        return;
+    }
+
+    const date = new Date(dateStr);
+    const now = new Date();
+    const diffMs = now - date;
+    const diffMins = Math.floor(diffMs / 60000);
+    const diffHours = Math.floor(diffMs / 3600000);
+    const diffDays = Math.floor(diffMs / 86400000);
+
+    let timeAgo;
+    if (diffMins < 1) {
+        timeAgo = 'только что';
+    } else if (diffMins < 60) {
+        timeAgo = diffMins + ' мин. назад';
+    } else if (diffHours < 24) {
+        timeAgo = diffHours + ' ч. назад';
+    } else if (diffDays < 7) {
+        timeAgo = diffDays + ' дн. назад';
+    } else {
+        timeAgo = date.toLocaleDateString('ru-RU');
+    }
+
+    document.getElementById('price-update-date').textContent = 'Обновлено: ' + timeAgo;
+}
+
 </script>
 {{end}}