Address review feedback on Muzi Base support

- rename the board class and files to MuziBaseBoard
- uppercase the build flags (MUZI_BASE, MUZI_BASE_SUPERIO)
- name the superIO envs muzi_base_{duo,uno}_superIO_companion_radio_ble so
  build.sh picks them up
- set MAX_CONTACTS to 350 like the other variants
- move the pin setup from initVariant() into MuziBaseBoard::begin()

variants/muzi_base/MuziBaseBoard.cpp

@@ -0,0 +1,64 @@
+#include <Arduino.h>
+#include <Wire.h>
+
+#include "MuziBaseBoard.h"
+
+#ifdef NRF52_POWER_MANAGEMENT
+const PowerMgtConfig power_config = {
+  .lpcomp_ain_channel = PWRMGT_LPCOMP_AIN,
+  .lpcomp_refsel = PWRMGT_LPCOMP_REFSEL,
+  .voltage_bootlock = PWRMGT_VOLTAGE_BOOTLOCK
+};
+
+void MuziBaseBoard::initiateShutdown(uint8_t reason) {
+  // Disable LoRa module power before shutdown
+  if (reason == SHUTDOWN_REASON_LOW_VOLTAGE ||
+      reason == SHUTDOWN_REASON_BOOT_PROTECT) {
+    configureVoltageWake(power_config.lpcomp_ain_channel, power_config.lpcomp_refsel);
+  }
+
+  enterSystemOff(reason);
+}
+#endif // NRF52_POWER_MANAGEMENT
+
+void MuziBaseBoard::begin() {
+  NRF52BoardDCDC::begin();
+  pinMode(PIN_VBAT_READ, INPUT);
+  pinMode(PIN_BATTERY_CHARGING, INPUT);
+  pinMode(PIN_CHARGER_FAULT, INPUT);
+  pinMode(LED_PIN, OUTPUT);
+  digitalWrite(LED_PIN, LOW);
+  // output latches default to HIGH, so pull these low right after enabling
+  pinMode(BUZZER_PIN, OUTPUT);
+  digitalWrite(BUZZER_PIN, LOW);
+  // gps power is driven by the sensor manager (mode switch). off to start.
+  pinMode(PIN_GPS_EN, OUTPUT);
+  digitalWrite(PIN_GPS_EN, LOW);
+  // 12V rail is only needed for the superIO display
+  pinMode(SCREEN_12V_ENABLE, OUTPUT);
+#ifdef MUZI_BASE_SUPERIO
+  digitalWrite(SCREEN_12V_ENABLE, HIGH); // Enable 12V power for SH1107 display
+  delay(250);
+#else
+  digitalWrite(SCREEN_12V_ENABLE, LOW);
+#endif
+  Wire.begin();
+  // delay(1000); // wait for display to initialize. otherwise it doesn't come up on boot.
+
+#ifdef PIN_USER_BTN
+  pinMode(PIN_USER_BTN, INPUT_PULLUP);
+#endif
+  pinMode(PIN_BUTTON1, INPUT_PULLUP);
+  pinMode(PIN_BUTTON2, INPUT_PULLUP);
+  pinMode(PIN_BUTTON3, INPUT_PULLUP);
+  pinMode(PIN_BUTTON4, INPUT_PULLUP);
+  pinMode(PIN_BUTTON5, INPUT_PULLUP);
+  pinMode(PIN_BUTTON6, INPUT_PULLUP);
+
+// #if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
+//   Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL);
+// #endif
+#ifdef NRF52_POWER_MANAGEMENT
+  checkBootVoltage(&power_config);
+#endif
+}