feat: add email endpoint

Endpoint/Controllers/Configuration/SetupController.cs

@@ -214,6 +214,32 @@ public class SetupController(ISetupToken setupToken, IMaintenanceModeNotConfigur
 
         return true;
     }
+
+    [HttpPost("SetEmail")]
+    [TokenAuthentication]
+    [BadRequestResponse]
+    public ActionResult<bool> SetEmail([FromBody] EmailRequest? request)
+    {
+        var settings = (request == null) switch
+        {
+            true => new EmailSettings(),
+            false => new EmailSettings
+            {
+                Server = request.Server,
+                From = request.From,
+                Password = request.Password,
+                Port = request.Port,
+                Ssl = request.Ssl,
+                User = request.User
+            }
+        };
+
+        var general = GeneralConfig;
+        general.EmailSettings = settings;
+        GeneralConfig = general;
+
+        return true;
+    }
     }