Initial commit: RNodeTHV4 boundary mode firmware for Heltec V4

Bridges LoRa mesh and TCP/WiFi backbone networks using microReticulum.
Based on microReticulum_Firmware with boundary mode additions:
- BoundaryMode.h: State management and EEPROM persistence
- BoundaryConfig.h: WiFi captive portal for configuration
- TcpInterface.h: TCP backbone interface with HDLC framing
- Display.h: Custom OLED layout with network status indicators
- Transport/Identity library patches for embedded memory constraints

FileSystemType.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#ifdef HAS_RNS
+
+// CBA This header file was required to break-out defined and includes here that could
+//  not be include in FileSystem.h due to conlficts with SPIFFS in Console.h
+
+#include "Boards.h"
+
+#define FS_TYPE_SPIFFS 0
+#define FS_TYPE_LITTLEFS 1
+#define FS_TYPE_INTERNALFS 2
+#define FS_TYPE_FLASHFS 3
+
+#if MCU_VARIANT == MCU_ESP32
+	#if defined(USE_FLASHFS)
+		#define FS_TYPE FS_TYPE_FLASHFS
+	#else
+		//#define FS_TYPE FS_TYPE_SPIFFS
+		#define FS_TYPE FS_TYPE_LITTLEFS
+	#endif
+#elif MCU_VARIANT == MCU_NRF52
+	#if defined(USE_FLASHFS)
+		#define FS_TYPE FS_TYPE_FLASHFS
+	#else
+		#define FS_TYPE FS_TYPE_INTERNALFS
+	#endif
+#else
+	#define FS_TYPE FS_TYPE_SPIFFS
+#endif
+
+#if FS_TYPE == FS_TYPE_SPIFFS
+#include <SPIFFS.h>
+#define FS SPIFFS
+#elif FS_TYPE == FS_TYPE_LITTLEFS
+#include <LittleFS.h>
+#define FS LittleFS
+#elif FS_TYPE == FS_TYPE_INTERNALFS
+#include <InternalFileSystem.h>
+#define FS InternalFS
+using namespace Adafruit_LittleFS_Namespace;
+#elif FS_TYPE == FS_TYPE_FLASHFS
+#include <Cached_SPIFlash.h>
+#include <FlashFileSystem.h>
+#define FS FlashFS
+using namespace Adafruit_LittleFS_Namespace;
+#else
+#error "FileSystem type not specified"
+#endif
+
+#endif