Refactor customer domain by removing obsolete files and updating main application structure

- Deleted customer domain files including entities, services, handlers, and forms to streamline the codebase.
- Removed customer-related routes and service initializations from the main application.
- Updated Swagger documentation to reflect the removal of customer endpoints and definitions.
- Cleaned up the project structure to enhance maintainability and focus on user management functionality.

internal/customer/validation.go

@@ -1,32 +0,0 @@
-package customer
-
-import (
-	"time"
-
-	"github.com/asaskevich/govalidator"
-)
-
-// init registers custom validators
-func init() {
-	// Register custom validators
-	govalidator.CustomTypeTagMap.Set("unix_timestamp", govalidator.CustomTypeValidator(func(i interface{}, context interface{}) bool {
-		switch v := i.(type) {
-		case int64:
-			// Check if timestamp is reasonable (not too old, not in the future)
-			now := time.Now().Unix()
-			minTimestamp := now - (100 * 365 * 24 * 60 * 60) // 100 years ago
-			maxTimestamp := now + (10 * 365 * 24 * 60 * 60)  // 10 years in future
-			return v >= minTimestamp && v <= maxTimestamp
-		case *int64:
-			if v == nil {
-				return true // nil is valid for optional fields
-			}
-			now := time.Now().Unix()
-			minTimestamp := now - (100 * 365 * 24 * 60 * 60) // 100 years ago
-			maxTimestamp := now + (10 * 365 * 24 * 60 * 60)  // 10 years in future
-			return *v >= minTimestamp && *v <= maxTimestamp
-		default:
-			return false
-		}
-	}))
-}