Wire competitor models, task type, usage count fix, and Competitors page handler

- Register Competitor + CompetitorQuote in AllModels()
- Add TaskTypeCompetitorImport task type constant
- CountUsage now checks pricelist_id, warehouse_pricelist_id, competitor_pricelist_id
- WebHandler: load competitors.html template, add Competitors() page handler

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/handlers/web.go

@@ -68,7 +68,7 @@ func NewWebHandler(templatesPath string, componentService *services.ComponentSer
 	}
 
 	// Load each page template with base
-	simplePages := []string{"admin_pricing.html", "pricelists.html", "pricelist_detail.html", "lot.html", "vendor_mappings.html"}
+	simplePages := []string{"admin_pricing.html", "pricelists.html", "pricelist_detail.html", "lot.html", "vendor_mappings.html", "competitors.html"}
 	for _, page := range simplePages {
 		pagePath := filepath.Join(templatesPath, page)
 		var tmpl *template.Template
@@ -143,6 +143,10 @@ func (h *WebHandler) VendorMappings(c *gin.Context) {
 	h.render(c, "vendor_mappings.html", gin.H{"ActivePage": "vendor_mappings"})
 }
 
+func (h *WebHandler) Competitors(c *gin.Context) {
+	h.render(c, "competitors.html", gin.H{"ActivePage": "competitors"})
+}
+
 func (h *WebHandler) Pricelists(c *gin.Context) {
 	h.render(c, "pricelists.html", gin.H{"ActivePage": "pricelists"})
 }

internal/models/models.go

@@ -23,6 +23,8 @@ func AllModels() []interface{} {
 		&PartnumberBook{},
 		&PartnumberBookItem{},
 		&VendorPartnumberSeen{},
+		&Competitor{},
+		&CompetitorQuote{},
 	}
 }
 

internal/repository/pricelist.go

@@ -459,10 +459,12 @@ func (r *PricelistRepository) DecrementUsageCount(id uint) error {
 		UpdateColumn("usage_count", gorm.Expr("GREATEST(usage_count - 1, 0)")).Error
 }
 
-// CountUsage returns number of configurations referencing pricelist.
+// CountUsage returns number of configurations referencing pricelist across all source columns.
 func (r *PricelistRepository) CountUsage(id uint) (int64, error) {
 	var count int64
-	if err := r.db.Table("qt_configurations").Where("pricelist_id = ?", id).Count(&count).Error; err != nil {
+	if err := r.db.Table("qt_configurations").
+		Where("pricelist_id = ? OR warehouse_pricelist_id = ? OR competitor_pricelist_id = ?", id, id, id).
+		Count(&count).Error; err != nil {
 		return 0, fmt.Errorf("counting configurations for pricelist %d: %w", id, err)
 	}
 	return count, nil

internal/tasks/task.go

@@ -19,6 +19,7 @@ const (
 	TaskTypeStockImport          TaskType = "stock_import"
 	TaskTypePricelistCreate      TaskType = "pricelist_create"
 	TaskTypePartnumberBookCreate TaskType = "partnumber_book_create"
+	TaskTypeCompetitorImport     TaskType = "competitor_import"
 )
 
 // Task represents a background task with progress tracking