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>

internal/services/configuration.go

@@ -2,6 +2,7 @@ package services
 
 import (
 	"errors"
+	"time"
 
 	"github.com/google/uuid"
 	"git.mchus.pro/mchus/quoteforge/internal/models"
@@ -205,6 +206,58 @@ func (s *ConfigurationService) ListTemplates(page, perPage int) ([]models.Config
 	return s.configRepo.ListTemplates(offset, perPage)
 }
 
+// RefreshPrices updates all component prices in the configuration with current prices
+func (s *ConfigurationService) RefreshPrices(uuid string, userID uint) (*models.Configuration, error) {
+	config, err := s.configRepo.GetByUUID(uuid)
+	if err != nil {
+		return nil, ErrConfigNotFound
+	}
+
+	if config.UserID != userID {
+		return nil, ErrConfigForbidden
+	}
+
+	// Update prices for all items
+	updatedItems := make(models.ConfigItems, len(config.Items))
+	for i, item := range config.Items {
+		// Get current component price
+		metadata, err := s.componentRepo.GetByLotName(item.LotName)
+		if err != nil || metadata.CurrentPrice == nil {
+			// Keep original item if component not found or no price available
+			updatedItems[i] = item
+			continue
+		}
+
+		// Update item with current price
+		updatedItems[i] = models.ConfigItem{
+			LotName:   item.LotName,
+			Quantity:  item.Quantity,
+			UnitPrice: *metadata.CurrentPrice,
+		}
+	}
+
+	// Update configuration
+	config.Items = updatedItems
+	total := updatedItems.Total()
+
+	// If server count is greater than 1, multiply the total by server count
+	if config.ServerCount > 1 {
+		total *= float64(config.ServerCount)
+	}
+
+	config.TotalPrice = &total
+
+	// Set price update timestamp
+	now := time.Now()
+	config.PriceUpdatedAt = &now
+
+	if err := s.configRepo.Update(config); err != nil {
+		return nil, err
+	}
+
+	return config, nil
+}
+
 // // Export configuration as JSON
 // type ConfigExport struct {
 // 	Name  string             `json:"name"`