fix(mqtt): gate Tauri commands behind feature

src-tauri/src/commands/connection.rs

@@ -1098,12 +1098,17 @@ async fn test_connection_with_info_inner(
                 Err("Message queue admin support is not compiled in this build. Rebuild with the 'mq-admin' feature."
                     .to_string())
             }
+            #[cfg(feature = "mq-admin")]
             DatabaseType::Mqtt => {
                 let mqtt_config = dbx_core::mqtt::types::MqttConnectionConfig::from_connection(&config)?;
                 let client = dbx_core::mqtt::client::MqttClient::connect(mqtt_config).await?;
                 client.disconnect().await;
                 Ok("Connection successful".to_string())
             }
+            #[cfg(not(feature = "mq-admin"))]
+            DatabaseType::Mqtt => {
+                Err("MQTT support is not compiled in this build. Rebuild with the 'mq-admin' feature.".to_string())
+            }
             db_type if database_capabilities::is_agent_type(&db_type) => {
                 match test_agent_connection(state, &config, &host, port).await {
                     Ok(details) => {
@@ -1455,11 +1460,16 @@ pub async fn connect_db(
             state.external_driver_pool("jdbc", &jdbc_config).await?
         }
         DatabaseType::Jdbc => state.external_driver_pool("jdbc", &db_config).await?,
+        #[cfg(feature = "mq-admin")]
         DatabaseType::Mqtt => {
             let mqtt_config = dbx_core::mqtt::types::MqttConnectionConfig::from_connection(&db_config)?;
             let client = dbx_core::mqtt::client::MqttClient::connect(mqtt_config).await?;
             PoolKind::Mqtt(client)
         }
+        #[cfg(not(feature = "mq-admin"))]
+        DatabaseType::Mqtt => {
+            return Err("MQTT support is not compiled in this build. Rebuild with the 'mq-admin' feature.".to_string());
+        }
         db_type => return Err(format!("Unsupported database type: {db_type:?}")),
     };
 

src-tauri/src/commands/mod.rs

@@ -26,6 +26,7 @@ pub mod mcp_bridge;
 pub mod mongo_cmd;
 #[cfg(feature = "mq-admin")]
 pub mod mq_cmd;
+#[cfg(feature = "mq-admin")]
 pub mod mqtt_cmd;
 pub mod nacos_cmd;
 pub mod plugins;