refactor: remove CurrentPrice from local_components and transition to pricelist-based pricing

## Overview
Removed the CurrentPrice and SyncedAt fields from local_components, transitioning to a
pricelist-based pricing model where all prices are sourced from local_pricelist_items
based on the configuration's selected pricelist.

## Changes

### Data Model Updates
- **LocalComponent**: Now stores only metadata (LotName, LotDescription, Category, Model)
  - Removed: CurrentPrice, SyncedAt (both redundant)
  - Pricing is now exclusively sourced from local_pricelist_items

- **LocalConfiguration**: Added pricelist selection fields
  - Added: WarehousePricelistID, CompetitorPricelistID
  - These complement the existing PricelistID (Estimate)

### Migrations
- Added migration "drop_component_unused_fields" to remove CurrentPrice and SyncedAt columns
- Added migration "add_warehouse_competitor_pricelists" to add new pricelist fields

### Component Sync
- Removed current_price from MariaDB query
- Removed CurrentPrice assignment in component creation
- SyncComponentPrices now exclusively updates based on pricelist_items via quote calculation

### Quote Calculation
- Added PricelistID field to QuoteRequest
- Updated local-first path to use pricelist_items instead of component.CurrentPrice
- Falls back to latest estimate pricelist if PricelistID not specified
- Maintains offline-first behavior: local queries work without MariaDB

### Configuration Refresh
- Removed fallback on component.CurrentPrice
- Prices are only refreshed from local_pricelist_items
- If price not found in pricelist, original price is preserved

### API Changes
- Removed CurrentPrice from ComponentView
- Components API no longer returns pricing information
- Pricing is accessed via QuoteService or PricelistService

### Code Cleanup
- Removed UpdateComponentPricesFromPricelist() method
- Removed EnsureComponentPricesFromPricelists() method
- Updated UnifiedRepository to remove offline pricing logic
- Updated converters to remove CurrentPrice mapping

## Architecture Impact
- Components = metadata store only
- Prices = managed by pricelist system
- Quote calculation = owns all pricing logic
- Local-first behavior preserved: SQLite queries work offline, no MariaDB dependency

## Testing
- Build successful
- All code compiles without errors
- Ready for migration testing with existing databases

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

internal/services/component.go

@@ -53,7 +53,6 @@ type ComponentView struct {
 	Category        string                `json:"category"`
 	CategoryName    string                `json:"category_name"`
 	Model           string                `json:"model"`
-	CurrentPrice    *float64              `json:"current_price"`
 	PriceFreshness  models.PriceFreshness `json:"price_freshness"`
 	PopularityScore float64               `json:"popularity_score"`
 	Specs           models.Specs          `json:"specs,omitempty"`
@@ -92,7 +91,6 @@ func (s *ComponentService) List(filter repository.ComponentFilter, page, perPage
 		view := ComponentView{
 			LotName:         c.LotName,
 			Model:           c.Model,
-			CurrentPrice:    c.CurrentPrice,
 			PriceFreshness:  c.GetPriceFreshness(30, 60, 90, 3),
 			PopularityScore: c.PopularityScore,
 			Specs:           c.Specs,
@@ -134,7 +132,6 @@ func (s *ComponentService) GetByLotName(lotName string) (*ComponentView, error)
 	view := &ComponentView{
 		LotName:         c.LotName,
 		Model:           c.Model,
-		CurrentPrice:    c.CurrentPrice,
 		PriceFreshness:  c.GetPriceFreshness(30, 60, 90, 3),
 		PopularityScore: c.PopularityScore,
 		Specs:           c.Specs,

internal/services/local_configuration.go

@@ -347,7 +347,7 @@ func (s *LocalConfigurationService) RefreshPrices(uuid string, ownerUsername str
 	}
 	latestPricelist, latestErr := s.localDB.GetLatestLocalPricelist()
 
-	// Update prices for all items
+	// Update prices for all items from pricelist
 	updatedItems := make(localdb.LocalConfigItems, len(localCfg.Items))
 	for i, item := range localCfg.Items {
 		if latestErr == nil && latestPricelist != nil {
@@ -362,20 +362,8 @@ func (s *LocalConfigurationService) RefreshPrices(uuid string, ownerUsername str
 			}
 		}
 
-		// Fallback to current component price from local cache
-		component, err := s.localDB.GetLocalComponent(item.LotName)
-		if err != nil || component.CurrentPrice == nil {
-			// Keep original item if component not found or no price available
-			updatedItems[i] = item
-			continue
-		}
-
-		// Update item with current price from local cache
-		updatedItems[i] = localdb.LocalConfigItem{
-			LotName:   item.LotName,
-			Quantity:  item.Quantity,
-			UnitPrice: *component.CurrentPrice,
-		}
+		// Keep original item if price not found in pricelist
+		updatedItems[i] = item
 	}
 
 	// Update configuration
@@ -672,7 +660,7 @@ func (s *LocalConfigurationService) RefreshPricesNoAuth(uuid string) (*models.Co
 	}
 	latestPricelist, latestErr := s.localDB.GetLatestLocalPricelist()
 
-	// Update prices for all items
+	// Update prices for all items from pricelist
 	updatedItems := make(localdb.LocalConfigItems, len(localCfg.Items))
 	for i, item := range localCfg.Items {
 		if latestErr == nil && latestPricelist != nil {
@@ -687,20 +675,8 @@ func (s *LocalConfigurationService) RefreshPricesNoAuth(uuid string) (*models.Co
 			}
 		}
 
-		// Fallback to current component price from local cache
-		component, err := s.localDB.GetLocalComponent(item.LotName)
-		if err != nil || component.CurrentPrice == nil {
-			// Keep original item if component not found or no price available
-			updatedItems[i] = item
-			continue
-		}
-
-		// Update item with current price from local cache
-		updatedItems[i] = localdb.LocalConfigItem{
-			LotName:   item.LotName,
-			Quantity:  item.Quantity,
-			UnitPrice: *component.CurrentPrice,
-		}
+		// Keep original item if price not found in pricelist
+		updatedItems[i] = item
 	}
 
 	// Update configuration

internal/services/quote.go

@@ -78,6 +78,7 @@ type QuoteRequest struct {
 		LotName  string `json:"lot_name"`
 		Quantity int    `json:"quantity"`
 	} `json:"items"`
+	PricelistID *uint `json:"pricelist_id,omitempty"` // Optional: use specific pricelist for pricing
 }
 
 type PriceLevelsRequest struct {
@@ -123,6 +124,16 @@ func (s *QuoteService) ValidateAndCalculate(req *QuoteRequest) (*QuoteValidation
 			Warnings: make([]string, 0),
 		}
 
+		// Determine which pricelist to use for pricing
+		pricelistID := req.PricelistID
+		if pricelistID == nil || *pricelistID == 0 {
+			// By default, use latest estimate pricelist
+			latestPricelist, err := s.localDB.GetLatestLocalPricelistBySource("estimate")
+			if err == nil && latestPricelist != nil {
+				pricelistID = &latestPricelist.ServerID
+			}
+		}
+
 		var total float64
 		for _, reqItem := range req.Items {
 			localComp, err := s.localDB.GetLocalComponent(reqItem.LotName)
@@ -142,13 +153,19 @@ func (s *QuoteService) ValidateAndCalculate(req *QuoteRequest) (*QuoteValidation
 				TotalPrice:  0,
 			}
 
-			if localComp.CurrentPrice != nil && *localComp.CurrentPrice > 0 {
-				item.UnitPrice = *localComp.CurrentPrice
-				item.TotalPrice = *localComp.CurrentPrice * float64(reqItem.Quantity)
-				item.HasPrice = true
-				total += item.TotalPrice
+			// Get price from pricelist_items
+			if pricelistID != nil {
+				price, found := s.lookupPriceByPricelistID(*pricelistID, reqItem.LotName)
+				if found && price > 0 {
+					item.UnitPrice = price
+					item.TotalPrice = price * float64(reqItem.Quantity)
+					item.HasPrice = true
+					total += item.TotalPrice
+				} else {
+					result.Warnings = append(result.Warnings, "No price available for: "+reqItem.LotName)
+				}
 			} else {
-				result.Warnings = append(result.Warnings, "No price available for: "+reqItem.LotName)
+				result.Warnings = append(result.Warnings, "No pricelist available for: "+reqItem.LotName)
 			}
 
 			result.Items = append(result.Items, item)

internal/services/sync/service.go

@@ -346,17 +346,10 @@ func (s *Service) SyncPricelists() (int, error) {
 	}
 
 	synced := 0
-	var latestEstimateLocalID uint
-	var latestEstimateCreatedAt time.Time
 	for _, pl := range serverPricelists {
 		// Check if pricelist already exists locally
 		existing, _ := s.localDB.GetLocalPricelistByServerID(pl.ID)
 		if existing != nil {
-			// Track latest estimate pricelist by created_at for component refresh.
-			if pl.Source == string(models.PricelistSourceEstimate) && (latestEstimateCreatedAt.IsZero() || pl.CreatedAt.After(latestEstimateCreatedAt)) {
-				latestEstimateCreatedAt = pl.CreatedAt
-				latestEstimateLocalID = existing.ID
-			}
 			continue
 		}
 
@@ -385,10 +378,6 @@ func (s *Service) SyncPricelists() (int, error) {
 			slog.Debug("synced pricelist with items", "version", pl.Version, "items", itemCount)
 		}
 
-		if pl.Source == string(models.PricelistSourceEstimate) && (latestEstimateCreatedAt.IsZero() || pl.CreatedAt.After(latestEstimateCreatedAt)) {
-			latestEstimateCreatedAt = pl.CreatedAt
-			latestEstimateLocalID = localPL.ID
-		}
 		synced++
 	}
 
@@ -399,16 +388,6 @@ func (s *Service) SyncPricelists() (int, error) {
 		slog.Info("deleted stale local pricelists", "deleted", removed)
 	}
 
-	// Update component prices from latest estimate pricelist only.
-	if latestEstimateLocalID > 0 {
-		updated, err := s.localDB.UpdateComponentPricesFromPricelist(latestEstimateLocalID)
-		if err != nil {
-			slog.Warn("failed to update component prices from pricelist", "error", err)
-		} else {
-			slog.Info("updated component prices from latest pricelist", "updated", updated)
-		}
-	}
-
 	// Update last sync time
 	s.localDB.SetLastSyncTime(time.Now())
 	s.RecordSyncHeartbeat()