Add LilyGO T-Beam 1W Support

variants/lilygo_tbeam_1w/TBeam1WBoard.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include <Arduino.h>
+#include <helpers/ESP32Board.h>
+#include "variant.h"
+
+// LilyGo T-Beam 1W with SX1262 + external PA (XY16P35 module)
+//
+// Power architecture (LDO is separate chip on T-Beam board, not inside XY16P35):
+//
+//   VCC (+4.0~+8.0V) ──┬──────────────────► XY16P35 VCC pin 5 (PA direct)
+//   (USB or Battery)   │
+//                      │   ┌───────────┐
+//                      └──►│ LDO Chip  │──► +3.3V ──► XY16P35 (SX1262 + LNA)
+//                          │ EN=GPIO40 │
+//                          └───────────┘
+//                      LDO_EN (GPIO 40): H @ +1.2V~VIN, active high, not floating
+//
+// Control signals:
+//   - LDO_EN (GPIO 40): HIGH enables LDO → powers SX1262 + LNA
+//   - TCXO_EN (DIO3):   HIGH enables TCXO (set to 1.8V per Meshtastic)
+//   - CTL (GPIO 21):    HIGH=RX (LNA on), LOW=TX (LNA off)
+//   - DIO2:             AUTO via SX126X_DIO2_AS_RF_SWITCH (TX path)
+//
+// Power notes:
+//   - PA needs VCC 4.0-8.0V for full 32dBm output
+//   - USB-C (3.9-6V) marginal; 7.4V battery recommended
+//   - Battery must support 2A+ discharge for high-power TX
+
+class TBeam1WBoard : public ESP32Board {
+private:
+  bool radio_powered = false;
+
+public:
+  void begin();
+  void onBeforeTransmit() override;
+  void onAfterTransmit() override;
+  uint16_t getBattMilliVolts() override;
+  const char* getManufacturerName() const override;
+  void powerOff() override;
+
+  // Fan control methods
+  void setFanEnabled(bool enabled);
+  bool isFanEnabled() const;
+};