Move dotnet api into new directory

web/backend/Infrastructure/Infrastructure.Email/IEmailProvider.cs

@@ -0,0 +1,30 @@
+namespace Infrastructure.Email;
+
+/// <summary>
+/// Service for sending emails via SMTP.
+/// </summary>
+public interface IEmailProvider
+{
+    /// <summary>
+    /// Sends an email to a single recipient.
+    /// </summary>
+    /// <param name="to">Recipient email address</param>
+    /// <param name="subject">Email subject line</param>
+    /// <param name="body">Email body (HTML or plain text)</param>
+    /// <param name="isHtml">Whether the body is HTML (default: true)</param>
+    Task SendAsync(string to, string subject, string body, bool isHtml = true);
+
+    /// <summary>
+    /// Sends an email to multiple recipients.
+    /// </summary>
+    /// <param name="to">List of recipient email addresses</param>
+    /// <param name="subject">Email subject line</param>
+    /// <param name="body">Email body (HTML or plain text)</param>
+    /// <param name="isHtml">Whether the body is HTML (default: true)</param>
+    Task SendAsync(
+        IEnumerable<string> to,
+        string subject,
+        string body,
+        bool isHtml = true
+    );
+}