feat(BE-59,60,61): build stock transfer API with validation and audit log

- Implement CreateOne for stock transfer with multi-delivery and validation
- Preload warehouse, location, and area relations in transfer response
- Add audit log for transfer
- Improve transaction handling and error management

internal/database/migrations/20251014024642_create_stock_transfer_details.up.sql

@@ -9,7 +9,6 @@ CREATE TABLE IF NOT EXISTS stock_transfer_details (
     quantity NUMERIC(15, 3) NOT NULL CHECK (quantity > 0),
     before_quantity NUMERIC(15, 3),
     after_quantity NUMERIC(15, 3),
-    note TEXT,
     created_at TIMESTAMPTZ DEFAULT NOW(),
     updated_at TIMESTAMPTZ DEFAULT NOW(),
     deleted_at TIMESTAMPTZ

internal/database/migrations/20251014024656_create_stock_transfer_deliveries.up.sql

@@ -12,7 +12,6 @@ CREATE TABLE IF NOT EXISTS stock_transfer_deliveries (
     document_path TEXT,
     shipping_cost_item NUMERIC(15,3),
     shipping_cost_total NUMERIC(15,3),
-    note TEXT,
     created_at TIMESTAMPTZ DEFAULT NOW(),
     updated_at TIMESTAMPTZ DEFAULT NOW(),
     deleted_at TIMESTAMPTZ

internal/database/seed/seeder.go

@@ -78,6 +78,10 @@ func Run(db *gorm.DB) error {
 			return err
 		}
 
+		if err := seedTransferStock(tx, adminID); err != nil {
+			return err
+		}
+
 		fmt.Println("✅ Master data seeding completed")
 		return nil
 	})
@@ -775,7 +779,7 @@ func seedProductWarehouse(tx *gorm.DB, createdBy uint) error {
 	}{
 		{ProductID: 1, WarehouseID: 1, Quantity: 100},
 		{ProductID: 2, WarehouseID: 2, Quantity: 200},
-		{ProductID: 1, WarehouseID: 1, Quantity: 300},
+		{ProductID: 2, WarehouseID: 1, Quantity: 300},
 	}
 
 	for _, seed := range seeds {
@@ -799,6 +803,84 @@ func seedProductWarehouse(tx *gorm.DB, createdBy uint) error {
 	return nil
 }
 
+func seedTransferStock(tx *gorm.DB, createdBy uint) error {
+	// Seeder Transfer Stock
+	// 1. Insert StockTransfer (header)
+	transfer := entity.StockTransfer{
+		FromWarehouseId: 1,
+		ToWarehouseId:   2,
+		Reason:          "Seed transfer stock",
+		TransferDate:    time.Now(),
+		MovementNumber:  "SEED-TRF-00001",
+		CreatedBy:       1,
+	}
+	if err := tx.Create(&transfer).Error; err != nil {
+		return err
+	}
+
+	// 2. Insert StockTransferDetail (detail)
+	details := []entity.StockTransferDetail{
+		{
+			StockTransferId: transfer.Id,
+			ProductId:       1,
+			Quantity:        10,
+		},
+		{
+			StockTransferId: transfer.Id,
+			ProductId:       2,
+			Quantity:        5,
+		},
+	}
+	for i := range details {
+		if err := tx.Create(&details[i]).Error; err != nil {
+			return err
+		}
+	}
+
+	// 3. Insert StockTransferDelivery (delivery)
+	deliveries := []entity.StockTransferDelivery{
+		{
+			StockTransferId:   transfer.Id,
+			SupplierId:        1,
+			VehiclePlate:      "B 1234 XYZ",
+			DriverName:        "Driver Seed",
+			DocumentPath:      "seed.pdf",
+			ShippingCostItem:  1000,
+			ShippingCostTotal: 2000,
+		},
+	}
+	for i := range deliveries {
+		if err := tx.Create(&deliveries[i]).Error; err != nil {
+			return err
+		}
+	}
+
+	detailMap := make(map[uint64]uint64)
+	for _, d := range details {
+		detailMap[d.ProductId] = d.Id
+	}
+
+	deliveryItems := []entity.StockTransferDeliveryItem{
+		{
+			StockTransferDeliveryId: deliveries[0].Id,
+			StockTransferDetailId:   detailMap[1],
+			Quantity:                50,
+		},
+		{
+			StockTransferDeliveryId: deliveries[0].Id,
+			StockTransferDetailId:   detailMap[2],
+			Quantity:                30,
+		},
+	}
+	for i := range deliveryItems {
+		if err := tx.Create(&deliveryItems[i]).Error; err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func ptr[T any](v T) *T {
 	return &v
 }