Enhance Customer Module with Validation and Username Handling

- Introduced a new ValidationService for customer operations to ensure valid username formats.
- Updated customer service and handler to utilize the new validation service, enhancing input validation during registration and updates.
- Modified CreateCustomerForm and UpdateCustomerForm to enforce username validation rules.
- Adjusted repository indexing to improve search efficiency by refining the text index for customer data.
- Ensured consistent handling of usernames across the customer module, improving overall data integrity and user experience.

internal/customer/service.go

@@ -60,10 +60,11 @@ type customerService struct {
 	companyService company.Service
 	redisClient    redis.Client
 	notification   notification.SDK
+	validator      ValidationService
 }
 
 // New creates a new customer service
-func NewService(repository Repository, logger logger.Logger, authService authorization.AuthorizationService, companyService company.Service, redisClient redis.Client, notificationSDK notification.SDK) Service {
+func NewService(repository Repository, logger logger.Logger, authService authorization.AuthorizationService, companyService company.Service, redisClient redis.Client, notificationSDK notification.SDK, validator ValidationService) Service {
 	return &customerService{
 		repository:     repository,
 		logger:         logger,
@@ -71,6 +72,7 @@ func NewService(repository Repository, logger logger.Logger, authService authori
 		companyService: companyService,
 		redisClient:    redisClient,
 		notification:   notificationSDK,
+		validator:      validator,
 	}
 }
 
@@ -82,6 +84,11 @@ func (s *customerService) Register(ctx context.Context, form *CreateCustomerForm
 		return nil, errors.New("customer with this email already exists")
 	}
 
+	// Check validator
+	if !s.validator.IsValidUsername(form.Username) {
+		return nil, errors.New("invalid username format")
+	}
+
 	// Verify that all company IDs exist
 	var Companies []string
 	if len(form.Companies) > 0 {
@@ -307,6 +314,11 @@ func (s *customerService) Update(ctx context.Context, id string, form *UpdateCus
 		customer.Email = form.Email
 	}
 
+	// Check validator
+	if !s.validator.IsValidUsername(form.Username) {
+		return nil, errors.New("invalid username format")
+	}
+
 	// Check if username already exists (if changing username)
 	if form.Username != "" && strings.ToLower(form.Username) != customer.Username {
 		existingCustomer, _ := s.repository.GetByUsername(ctx, strings.ToLower(form.Username))