feat(BE-58,59,60,61): implement stock transfer API, validation, audit log, and schema update

- Build stock transfer API with nested details, deliveries, and items
- Extend DB schema for stock transfers
- Implement validation for transfer request and stock
- Prepare/implement transfer audit log structure
- Preload all relations for complete response
- Update DTOs for nested response
- Remove redundant root fields, use relation objects

internal/modules/inventory/transfers/repositories/stock_transfer_detail.repository.go

@@ -1,6 +1,10 @@
+// Find all details by StockTransferId
+
 package repositories
 
 import (
+	"context"
+
 	"gitlab.com/mbugroup/lti-api.git/internal/common/repository"
 	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
 	"gorm.io/gorm"
@@ -8,7 +12,7 @@ import (
 
 type StockTransferDetailRepository interface {
 	repository.BaseRepository[entity.StockTransferDetail]
-	// Tambahkan custom method jika perlu
+	FindByTransferId(ctx context.Context, transferId uint64, out *[]entity.StockTransferDetail) error
 }
 
 type StockTransferDetailRepositoryImpl struct {
@@ -20,3 +24,6 @@ func NewStockTransferDetailRepository(db *gorm.DB) StockTransferDetailRepository
 		BaseRepositoryImpl: repository.NewBaseRepository[entity.StockTransferDetail](db),
 	}
 }
+func (r *StockTransferDetailRepositoryImpl) FindByTransferId(ctx context.Context, transferId uint64, out *[]entity.StockTransferDetail) error {
+	return r.DB().WithContext(ctx).Where("stock_transfer_id = ?", transferId).Find(out).Error
+}