Refactor user domain to utilize string IDs and integrate MongoDB ORM

- Updated User entity to embed MongoDB model and replace uuid.UUID with string for ID fields.
- Modified repository methods to accept string IDs instead of uuid.UUID, enhancing compatibility with MongoDB.
- Refactored service and handler methods to align with the new ID type, ensuring consistent usage across the user management functionality.
- Improved response handling in UserListResponse to directly use string IDs.
- Streamlined index creation in the user repository using the MongoDB ORM for better maintainability.

internal/user/form.go

@@ -112,29 +112,14 @@ type UserListResponse struct {
 
 // Helper function to convert User to UserResponse
 func (u *User) ToResponse() *UserResponse {
-	companyID := ""
-	if u.CompanyID != nil {
-		companyID = u.CompanyID.String()
-	}
-
-	createdBy := ""
-	if u.CreatedBy != nil {
-		createdBy = u.CreatedBy.String()
-	}
-
-	updatedBy := ""
-	if u.UpdatedBy != nil {
-		updatedBy = u.UpdatedBy.String()
-	}
-
 	return &UserResponse{
-		ID:           u.ID.String(),
+		ID:           u.ID,
 		FullName:     u.FullName,
 		Username:     u.Username,
 		Email:        u.Email,
 		Role:         string(u.Role),
 		Status:       string(u.Status),
-		CompanyID:    &companyID,
+		CompanyID:    u.CompanyID,
 		Department:   u.Department,
 		Position:     u.Position,
 		Phone:        u.Phone,
@@ -143,7 +128,7 @@ func (u *User) ToResponse() *UserResponse {
 		LastLoginAt:  u.LastLoginAt,
 		CreatedAt:    u.CreatedAt,
 		UpdatedAt:    u.UpdatedAt,
-		CreatedBy:    &createdBy,
-		UpdatedBy:    &updatedBy,
+		CreatedBy:    u.CreatedBy,
+		UpdatedBy:    u.UpdatedBy,
 	}
 }