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>

internal/warehouse/snapshot_test.go

@@ -75,7 +75,7 @@ func TestLoadLotMetricsLatestOnlyIncludesPartnumbers(t *testing.T) {
 		t.Fatalf("seed stock rows: %v", err)
 	}
 
-	qtyByLot, pnsByLot, err := LoadLotMetrics(db, []string{"CPU_X"}, true)
+	qtyByLot, pnsByLot, _, err := LoadLotMetrics(db, []string{"CPU_X"}, true)
 	if err != nil {
 		t.Fatalf("LoadLotMetrics: %v", err)
 	}