fix: port T-Beam 1W hardware corrections

Adapt the validated fan thermostat, battery ADC calibration, GPS baud, SX1262 register patch, and 1700us PA ramp behavior from mintylinux/Meshcore-T-beam-1W-Firmware to the current board architecture. Also make Arduino 3 full-build dependency switching reliable after standard ESP32 builds and guard the release hardware contract with regression coverage.

examples/simple_room_server/main.cpp

@@ -192,6 +192,9 @@ void loop() {
   if (display_ready) ui_task.loop();
 #endif
   rtc_clock.tick();
+#ifdef TBEAM_1W
+  board.updateFanControl();
+#endif
 #ifdef HAS_EXTERNAL_WATCHDOG
   external_watchdog.loop();
 #endif