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/contribute.md

@@ -0,0 +1,39 @@
+[title]: <> (Donate)
+## Keep Communications Free and Open
+Please take part in keeping the continued development, maintenance and distribution of the RNode ecosystem possible by donating via one of the following channels:
+
+- Monero<br/>
+  ```
+  84FpY1QbxHcgdseePYNmhTHcrgMX4nFfBYtz2GKYToqHVVhJp8Eaw1Z1EedRnKD19b3B8NiLCGVxzKV17UMmmeEsCrPyA5w
+  ```
+  <br/><br/>
+- Ethereum<br/>
+  ```
+  0xFDabC71AC4c0C78C95aDDDe3B4FA19d6273c5E73
+  ```
+  <br/><br/>
+- Bitcoin<br/>
+  ```
+  35G9uWVzrpJJibzUwpNUQGQNFzLirhrYAH
+  ```
+  <br/><br/>
+- Ko-Fi<br/>
+  <a href="https://ko-fi.com/markqvist">`https://ko-fi.com/markqvist`</a>
+
+## Spread Knowledge and Awareness
+Another great way to contribute, is to spread awareness about the RNode project. Here's some ideas:
+
+- Introduce the concepts of Free & Open Communications Systems to your community
+- Teach others to build and use RNodes, and how to set up resilient and private communications systems
+- Learn about using Reticulum to set up resilient communications networks, and teach these skills to people in your area that need them
+
+## Contribute Code & Material
+If you like to write, build and design, there are plenty of oppertunities to take part in the community around RNode, and the wider Reticulum community as well.
+
+There's always plenty of work to do, from writing code, tutorials and guides, to designing parts, devices and integrations, and translating material to other languages.
+
+You can find us the following places:
+
+- The [Reticulum Matrix Channel](element://room/!TRaVWNnQhAbvuiSnEK%3Amatrix.org?via=matrix.org) at `#reticulum:matrix.org`
+- The [discussion forum](https://github.com/markqvist/Reticulum/discussions) on GitHub
+- The [Reticulum subreddit](https://reddit.com/r/reticulum)