Add defaults and docs to RabbitMqConfiguration properties

Updated the `RabbitMqConfiguration` class to include:
- XML documentation for all properties, improving clarity.
- Default values for `QueueName`, `ExchangeName`, `RoutingKey`,
  `DlqQueueName`, `DlqExchangeName`, and `DlqRoutingKey` to define
  RabbitMQ naming conventions.
Replaced undocumented properties with documented versions to enhance
code readability and maintainability.

src/infrastructure/DigitalData.MessagingService.RabbitMQ/RabbitMqConfiguration.cs

@@ -45,11 +45,35 @@ namespace DigitalData.MessagingService.RabbitMQ
         /// </summary>
         public int NetworkRecoveryIntervalSeconds { get; set; } = 10;
 
-        public string QueueName { get; set; }
+        /// <summary>
-        public string ExchangeName { get; set; }
+        /// Name of the main queue where outbound email messages are consumed from.
-        public string RoutingKey { get; set; }
+        /// </summary>
-        public string DlqQueueName { get; set; }
+        public string QueueName { get; set; } = "messaging-service.email.outbox";
-        public string DlqExchangeName { get; set; }
+
-        public string DlqRoutingKey { get; set; }
+        /// <summary>
+        /// Name of the exchange to which email messages are published.
+        /// Messages are routed from this exchange to <see cref="QueueName"/> via <see cref="RoutingKey"/>.
+        /// </summary>
+        public string ExchangeName { get; set; } = "messaging-service.emails";
+
+        /// <summary>
+        /// Routing key used to bind <see cref="QueueName"/> to <see cref="ExchangeName"/>.
+        /// </summary>
+        public string RoutingKey { get; set; } = "email.outbox";
+
+        /// <summary>
+        /// Name of the Dead Letter Queue (DLQ) where messages that could not be processed are routed.
+        /// </summary>
+        public string DlqQueueName { get; set; } = "messaging-service.email.outbox.dlq";
+
+        /// <summary>
+        /// Name of the Dead Letter Exchange (DLX) that routes rejected or expired messages to <see cref="DlqQueueName"/>.
+        /// </summary>
+        public string DlqExchangeName { get; set; } = "messaging-service.emails.dlq";
+
+        /// <summary>
+        /// Routing key used to bind <see cref="DlqQueueName"/> to <see cref="DlqExchangeName"/>.
+        /// </summary>
+        public string DlqRoutingKey { get; set; } = "email.outbox.dlq";
     }
 }