feat: add СХД configuration type with storage-specific tabs and LOT catalog guide

- Add config_type field ("server"|"storage") to Configuration and LocalConfiguration
- Create modal: Сервер/СХД segmented control in configs.html and project_detail.html
- Configurator: ENC/DKC/CTL categories in Base tab, HIC section in PCI tab hidden for server configs
- Add SW tab (categories: SW) to configurator, visible only when components present
- TAB_CONFIG.pci: add HIC section for storage HIC adapters (separate from server HBA/NIC)
- Migration 029: ALTER TABLE qt_configurations ADD COLUMN config_type
- Fix: skip Error 1833 (Cannot change column used in FK) in GORM AutoMigrate
- Operator guide: docs/storage-components-guide.md with LOT naming rules and DE4000H catalog template

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

internal/models/configuration.go

@@ -111,6 +111,7 @@ type Configuration struct {
 	WarehousePricelistID  *uint       `gorm:"index" json:"warehouse_pricelist_id,omitempty"`
 	CompetitorPricelistID *uint       `gorm:"index" json:"competitor_pricelist_id,omitempty"`
 	VendorSpec            VendorSpec  `gorm:"type:json" json:"vendor_spec,omitempty"`
+	ConfigType            string      `gorm:"size:20;default:server" json:"config_type"` // "server" | "storage"
 	DisablePriceRefresh   bool        `gorm:"default:false" json:"disable_price_refresh"`
 	OnlyInStock           bool        `gorm:"default:false" json:"only_in_stock"`
 	Line                  int         `gorm:"column:line_no;index" json:"line"`

internal/models/models.go

@@ -31,7 +31,9 @@ func Migrate(db *gorm.DB) error {
 			errStr := err.Error()
 			if strings.Contains(errStr, "Can't DROP") ||
 				strings.Contains(errStr, "Duplicate key name") ||
-				strings.Contains(errStr, "check that it exists") {
+				strings.Contains(errStr, "check that it exists") ||
+				strings.Contains(errStr, "Cannot change column") ||
+				strings.Contains(errStr, "used in a foreign key constraint") {
 				slog.Warn("migration warning (skipped)", "model", model, "error", errStr)
 				continue
 			}