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/entities/product_warehouse.go

@@ -0,0 +1,23 @@
+package entities
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type ProductWarehouse struct {
+	Id          uint           `json:"id" gorm:"primaryKey;autoIncrement"`
+	ProductId   uint           `json:"product_id" gorm:"not null"`
+	WarehouseId uint           `json:"warehouse_id" gorm:"not null"`
+	Quantity    int            `json:"quantity" gorm:"default:0"`
+	CreatedAt   time.Time      `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt   time.Time      `json:"updated_at" gorm:"autoUpdateTime"`
+	CreatedBy   uint           `json:"created_by" gorm:"not null"`
+	DeletedAt   gorm.DeletedAt `json:"deleted_at" gorm:"index"`
+
+	// Relations
+	Product     Product   `json:"product,omitempty" gorm:"foreignKey:ProductId;references:Id"`
+	Warehouse   Warehouse `json:"warehouse,omitempty" gorm:"foreignKey:WarehouseId;references:Id"`
+	CreatedUser User      `json:"created_user,omitempty" gorm:"foreignKey:CreatedBy;references:Id"`
+}