Ajout prise en charge ESP-Display

include/RelayController.h

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+/**
+ * @file RelayController.h
+ * @brief Relay control for switching between 2-rail and 3-rail track configurations
+ * 
+ * Controls a relay module to switch track wiring between:
+ * - 2-rail mode: Standard DC/DCC operation
+ * - 3-rail mode: Center rail + outer rails configuration
+ * 
+ * @author Locomotive Test Bench Project
+ * @date 2025
+ */
+
+#ifndef RELAY_CONTROLLER_H
+#define RELAY_CONTROLLER_H
+
+#include <Arduino.h>
+
+// Pin definition for relay control
+#define RELAY_PIN 4    ///< Relay control pin (active HIGH)
+
+/**
+ * @class RelayController
+ * @brief Controls relay for track configuration switching
+ * 
+ * Simple relay control for switching between 2-rail and 3-rail modes.
+ * Relay energized = 3-rail mode
+ * Relay de-energized = 2-rail mode
+ */
+class RelayController {
+public:
+    /**
+     * @brief Constructor
+     */
+    RelayController();
+    
+    /**
+     * @brief Initialize relay controller hardware
+     * 
+     * Configures GPIO pin and sets to default 2-rail mode.
+     */
+    void begin();
+    
+    /**
+     * @brief Set rail mode
+     * @param is3Rail true = 3-rail mode, false = 2-rail mode
+     */
+    void setRailMode(bool is3Rail);
+    
+    /**
+     * @brief Get current rail mode
+     * @return true if 3-rail mode, false if 2-rail mode
+     */
+    bool is3RailMode() { return is3Rail; }
+    
+private:
+    bool is3Rail;  ///< Current rail mode state
+};
+
+#endif // RELAY_CONTROLLER_H