feat(BE-34): extend DB schema and update master data APIs [partial]

✅ DB Schema: product_warehouse entity and migration
✅ Master Data: added filter params to getall APIs
🚧 Pending: stock_logs implementation and adjustment APIs

internal/modules/inventory/product-warehouses/repositories/product_warehouse.repository.go

@@ -0,0 +1,53 @@
+package repository
+
+import (
+	"context"
+
+	"gitlab.com/mbugroup/lti-api.git/internal/common/repository"
+	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
+	"gorm.io/gorm"
+)
+
+type ProductWarehouseRepository interface {
+	repository.BaseRepository[entity.ProductWarehouse]
+	ProductWarehouseExists(ctx context.Context, productId, warehouseId uint, excludeID *uint) (bool, error)
+	IsProductExist(ctx context.Context, productId uint) (bool, error)
+	IsWarehouseExist(ctx context.Context, warehouseId uint) (bool, error)
+	ExistsByID(ctx context.Context, id uint) (bool, error)
+}
+
+type ProductWarehouseRepositoryImpl struct {
+	*repository.BaseRepositoryImpl[entity.ProductWarehouse]
+	db *gorm.DB
+}
+
+func NewProductWarehouseRepository(db *gorm.DB) ProductWarehouseRepository {
+	return &ProductWarehouseRepositoryImpl{
+		BaseRepositoryImpl: repository.NewBaseRepository[entity.ProductWarehouse](db),
+		db:                 db,
+	}
+}
+
+func (r *ProductWarehouseRepositoryImpl) ProductWarehouseExists(ctx context.Context, productId, warehouseId uint, excludeID *uint) (bool, error) {
+	var count int64
+	query := r.db.WithContext(ctx).Model(&entity.ProductWarehouse{}).
+		Where("product_id = ? AND warehouse_id = ?", productId, warehouseId)
+	if excludeID != nil {
+		query = query.Where("id != ?", *excludeID)
+	}
+	if err := query.Count(&count).Error; err != nil {
+		return false, err
+	}
+	return count > 0, nil
+}
+
+func (r *ProductWarehouseRepositoryImpl) IsProductExist(ctx context.Context, productId uint) (bool, error) {
+	return repository.Exists[entity.Product](ctx, r.db, productId)
+}
+func (r *ProductWarehouseRepositoryImpl) IsWarehouseExist(ctx context.Context, warehouseId uint) (bool, error) {
+	return repository.Exists[entity.Warehouse](ctx, r.db, warehouseId)
+}
+
+func (r *ProductWarehouseRepositoryImpl) ExistsByID(ctx context.Context, id uint) (bool, error) {
+	return repository.Exists[entity.ProductWarehouse](ctx, r.db, id)
+}