feat(notifications): additive Transport column on SmtpConfigurations

src/ZB.MOM.WW.ScadaBridge.Commons/Entities/Notifications/SmtpConfiguration.cs

@@ -14,6 +14,14 @@ public class SmtpConfiguration
     public string? Credentials { get; set; }
     /// <summary>Gets or sets the TLS mode (None, StartTLS, or SSL), or null to use the provider default.</summary>
     public string? TlsMode { get; set; }
+
+    /// <summary>
+    /// Gets or sets the email delivery transport ("Smtp" or "Ews"). Null/empty means Smtp
+    /// (legacy rows). Under Ews, <see cref="Host"/> holds the full EWS endpoint URL,
+    /// <see cref="AuthType"/> must be Basic, and Port/TlsMode/OAuth2* are unused.
+    /// </summary>
+    public string? Transport { get; set; }
+
     /// <summary>Gets or sets the sender address placed in the From header.</summary>
     public string FromAddress { get; set; }
     /// <summary>Gets or sets the connection timeout in seconds.</summary>