Add hide component feature, usage indicators, and Docker support

- Add is_hidden field to hide components from configurator
- Add colored dot indicator showing component usage status:
  - Green: available in configurator
  - Cyan: used as source for meta-articles
  - Gray: hidden from configurator
- Optimize price recalculation with caching and skip unchanged
- Show current lot name during price recalculation
- Add Dockerfile (Alpine-based multi-stage build)
- Add docker-compose.yml and .dockerignore

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

internal/repository/component.go

@@ -16,11 +16,12 @@ func NewComponentRepository(db *gorm.DB) *ComponentRepository {
 }
 
 type ComponentFilter struct {
-	Category  string
-	Search    string
-	HasPrice  bool
-	SortField string
-	SortDir   string
+	Category     string
+	Search       string
+	HasPrice     bool
+	ExcludeHidden bool
+	SortField    string
+	SortDir      string
 }
 
 func (r *ComponentRepository) List(filter ComponentFilter, offset, limit int) ([]models.LotMetadata, int64, error) {
@@ -42,6 +43,9 @@ func (r *ComponentRepository) List(filter ComponentFilter, offset, limit int) ([
 	if filter.HasPrice {
 		query = query.Where("current_price IS NOT NULL AND current_price > 0")
 	}
+	if filter.ExcludeHidden {
+		query = query.Where("is_hidden = ? OR is_hidden IS NULL", false)
+	}
 
 	query.Count(&total)