feat: add LOT creation, auto-save mappings, disable auto warehouse pricelist

- Add LOT creation functionality in pricing admin
  - New API endpoint POST /api/admin/pricing/lots
  - Modal form for creating new LOT with auto-category detection
  - Creates entries in both lot and qt_lot_metadata tables

- Implement auto-save for stock mappings
  - Auto-save on change for partnumber → LOT mappings
  - Visual feedback (orange during save, green on success, red on error)
  - Works in both main mappings table and import suggestions

- Improve stock import suggestions UI
  - Remove "Причина" column from suggestions table
  - Increase LOT and Partnumber column widths to 33% each
  - Better visual balance in the table layout

- Disable automatic warehouse pricelist creation on stock_log import
  - Import now completes at 100% after stock_log update
  - Manual pricelist creation available via UI when needed
  - Faster import process without auto-generation overhead

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

cmd/pfs/main.go

@@ -581,6 +581,7 @@ func setupRouter(cfg *config.Config, configPath string, connMgr *db.ConnectionMa
 			pricingAdmin.POST("/recalculate-all", pricingHandler.RecalculateAll)
 			pricingAdmin.GET("/lots", pricingHandler.ListLots)
 			pricingAdmin.GET("/lots-table", pricingHandler.ListLotsTable)
+			pricingAdmin.POST("/lots", pricingHandler.CreateLot)
 			pricingAdmin.POST("/stock/import", pricingHandler.ImportStockLog)
 			pricingAdmin.GET("/stock/mappings", pricingHandler.ListStockMappings)
 			pricingAdmin.POST("/stock/mappings", pricingHandler.UpsertStockMapping)