feat[BE#US386]: add production standards module with CRUD operations

- Created database migration for production standards and related tables.
- Implemented entities for ProductionStandard, ProductionStandardDetail, and StandardGrowthDetail.
- Developed controller for handling production standard requests.
- Added DTOs for data transfer between layers.
- Implemented service layer for business logic related to production standards.
- Created repository interfaces and implementations for data access.
- Added validation for production standard requests.
- Registered routes for production standards in the main application.

internal/entities/production_standard.go

@@ -0,0 +1,19 @@
+package entities
+
+import (
+	"time"
+)
+
+type ProductionStandard struct {
+	Id             uint       `gorm:"primaryKey;autoIncrement"`
+	Name           string     `gorm:"type:varchar(100);uniqueIndex;not null"`
+	ProjectCategory string    `gorm:"type:varchar(20);not null"`
+	CreatedAt      time.Time  `gorm:"type:timestamptz;not null"`
+	UpdatedAt      time.Time  `gorm:"type:timestamptz;not null"`
+	DeletedAt      *time.Time `gorm:"type:timestamptz"`
+	CreatedBy      uint       `gorm:"not null"`
+
+	CreatedUser              User                       `gorm:"foreignKey:CreatedBy;references:Id"`
+	ProductionStandardDetails []ProductionStandardDetail `gorm:"foreignKey:ProductionStandardId;references:Id"`
+	StandardGrowthDetails    []StandardGrowthDetail    `gorm:"foreignKey:ProductionStandardId;references:Id"`
+}