dto / mapper / model separation of verification purpose

frontend/pshared/lib/data/mapper/verification/purpose.dart

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+import 'package:pshared/data/dto/verification/purpose.dart';
+import 'package:pshared/models/verification/purpose.dart';
+
+extension VerificationPurposeDTOMapper on VerificationPurposeDTO {
+  VerificationPurpose toDomain() {
+    switch (this) {
+      case VerificationPurposeDTO.login:
+        return VerificationPurpose.login;
+      case VerificationPurposeDTO.payout:
+        return VerificationPurpose.payout;
+      case VerificationPurposeDTO.accountActivation:
+        return VerificationPurpose.accountActivation;
+      case VerificationPurposeDTO.emailChange:
+        return VerificationPurpose.emailChange;
+      case VerificationPurposeDTO.passwordReset:
+        return VerificationPurpose.passwordReset;
+    }
+  }
+}
+
+extension VerificationPurposeMapper on VerificationPurpose {
+  VerificationPurposeDTO toDTO() {
+    switch (this) {
+      case VerificationPurpose.login:
+        return VerificationPurposeDTO.login;
+      case VerificationPurpose.payout:
+        return VerificationPurposeDTO.payout;
+      case VerificationPurpose.accountActivation:
+        return VerificationPurposeDTO.accountActivation;
+      case VerificationPurpose.emailChange:
+        return VerificationPurposeDTO.emailChange;
+      case VerificationPurpose.passwordReset:
+        return VerificationPurposeDTO.passwordReset;
+    }
+  }
+}