Added UART as a communication interface option.

vesper/vesper.ino

@@ -513,6 +513,9 @@ void loop()
 		lastWsCleanup = millis();
 	}
 
+	// Process UART command input from external devices (LCD panel, buttons)
+	communication.loop();
+
 	// 🔥 DEBUG: Log every 10 seconds to verify we're still running
 	static unsigned long lastLog = 0;
 	if (millis() - lastLog > 10000) {