feat(ht_email_repository): implement sendOtpEmail functionality

- Add HtEmailClient dependency for email sending operations
- Implement sendOtpEmail method to delegate OTP email sending
- Handle HtHttpException subtypes for error propagation
- Update class documentation to reflect new repository purpose

Author: fulleni

lib/src/ht_email_repository.dart

@@ -1,7 +1,42 @@
+import 'package:ht_email_client/ht_email_client.dart';
+import 'package:ht_shared/ht_shared.dart'; // For HtHttpException
+
 /// {@template ht_email_repository}
-/// A Very Good Project created by Very Good CLI.
+/// A repository that handles email sending operations.
+///
+/// This repository interacts with an underlying [HtEmailClient]
+/// to send emails, such as One-Time Passwords (OTPs).
 /// {@endtemplate}
 class HtEmailRepository {
   /// {@macro ht_email_repository}
-  const HtEmailRepository();
+  ///
+  /// Requires an instance of [HtEmailClient] to handle the actual
+  /// email sending operations.
+  const HtEmailRepository({
+    required HtEmailClient emailClient,
+  }) : _emailClient = emailClient;
+
+  final HtEmailClient _emailClient;
+
+  /// Sends a One-Time Password (OTP) email via the email client.
+  ///
+  /// Delegates the call to the injected [HtEmailClient].
+  ///
+  /// Throws [HtHttpException] subtypes on failure, as propagated
+  /// from the client.
+  Future<void> sendOtpEmail({
+    required String recipientEmail,
+    required String otpCode,
+  }) async {
+    try {
+      await _emailClient.sendOtpEmail(
+        recipientEmail: recipientEmail,
+        otpCode: otpCode,
+      );
+    } on HtHttpException {
+      rethrow; // Propagate client-level exceptions
+    }
+    // Catch-all for unexpected errors is generally avoided here,
+    // relying on the client's defined exceptions.
+  }
 }