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

Console/source/recipes.md

@@ -0,0 +1,5 @@
+[title]: <> (RNode Recipes)
+## RNode Build Recipes
+This section contains a library of build recipes for various types of RNodes. All the recipes contain necessary plans, instructions and 3D-printable files for completing the build.
+
+{TOPIC:builds}