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.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <MeshCore.h>
+#include <Arduino.h>
+#include <helpers/NRF52Board.h>
+
+// The Muzi Base PCB ships in two radio flavors. Keep the user-facing identity
+// (OTA/DFU name and reported manufacturer) distinct per radio even though the
+// board logic is shared.
+#if defined(USE_SX1262)
+  #define MUZI_BASE_OTA_NAME  "MUZI_BASE_UNO_OTA"
+  #define MUZI_BASE_MFR_NAME  "Muzi Base Uno"
+#else
+  #define MUZI_BASE_OTA_NAME  "MUZI_BASE_DUO_OTA"
+  #define MUZI_BASE_MFR_NAME  "Muzi Base Duo"
+#endif
+
+class MuziBaseBoard : public NRF52BoardDCDC {
+protected:
+#ifdef NRF52_POWER_MANAGEMENT
+  void initiateShutdown(uint8_t reason) override;
+#endif
+
+public:
+  MuziBaseBoard() : NRF52Board(MUZI_BASE_OTA_NAME) {}
+  void begin();
+
+  #define BATTERY_SAMPLES 8
+
+  uint16_t getBattMilliVolts() override {
+    analogReadResolution(12);
+    analogReference(AR_INTERNAL_3_0);
+    delay(1);
+
+    uint32_t raw = 0;
+    for (int i = 0; i < BATTERY_SAMPLES; i++) {
+      raw += analogRead(PIN_VBAT_READ);
+    }
+    raw = raw / BATTERY_SAMPLES;
+
+    // ADC_MULTIPLIER is the voltage divider ratio
+    return (raw * ADC_MULTIPLIER * AREF_VOLTAGE) / 4.096;
+  }
+
+  const char* getManufacturerName() const override {
+    return MUZI_BASE_MFR_NAME;
+  }
+};