Unified Quote Journal (parts_log) v3

- New unified append-only quote log table parts_log replaces three
  separate log tables (stock_log, partnumber_log_competitors, lot_log)
- Migrations 042-049: extend supplier, create parts_log/import_formats/
  ignore_rules, rework qt_lot_metadata composite PK, add lead_time_weeks
  to pricelist_items, backfill data, migrate ignore rules
- New services: PartsLogBackfillService, ImportFormatService,
  UnifiedImportService; new world pricelist type (all supplier types)
- qt_lot_metadata PK changed to (lot_name, pricelist_type); all queries
  now filter WHERE pricelist_type='estimate'
- Fix pre-existing bug: qt_component_usage_stats column names
  quotes_last30d/quotes_last7d (no underscore) — added explicit gorm tags
- Bible: full table inventory, baseline schema snapshot, updated pricelist/
  data-rules/api/history/architecture docs

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

cmd/pfs/main.go

@@ -258,7 +258,8 @@ func startEmbeddedScheduler(ctx context.Context, mariaDB *gorm.DB, cfg *config.C
 
 	alertService := alerts.NewService(alertRepo, componentRepo, priceRepo, statsRepo, cfg.Alerts, cfg.Pricing)
 	pricingService := pricing.NewService(componentRepo, priceRepo, cfg.Pricing)
-	embeddedScheduler := scheduler.New(mariaDB, alertService, pricingService, statsRepo, cfg.Scheduler)
+	backfillService := services.NewPartsLogBackfillService(mariaDB)
+	embeddedScheduler := scheduler.New(mariaDB, alertService, pricingService, statsRepo, backfillService, cfg.Scheduler)
 	go embeddedScheduler.Start(ctx)
 }