Arduino Nesso N1 support

[fukuen]

Adds hardware support for the new Arduino Nesso N1
https://store-usa.arduino.cc/products/nesso-n1

Datasheet: https://docs.arduino.cc/resources/datasheets/TPX00227-datasheet.pdf

Issue: #8744

🤝 Attestations

• I have tested that my proposed changes behave as described.
• I don't have the affected hardware to test my code changes adequately against regressions

[vidplace7]

#9122 should be completed/merged before any further ESP32c6 variants are considered for merge. The ESP32c6 variant structure has received a major rework as part of that effort.

[mokjpn]

Tested this PR on Arduino Nesso N1 hardware in a real-world setup.

Summary of results:

• Firmware builds successfully from this branch
• Device joins Meshtastic network without issues
• Messaging (chat) works reliably between nodes
• Telemetry confirmed:
  • BMP280 (I2C via Qwiic connector) is detected correctly
  • Temperature / pressure data are published as telemetry
  • MQTT uplink is working and telemetry data can be collected externally

Test environment:

• Network size: 3–5 nodes
• Region: AS923 (Japan)
• Sensor: BMP280 via Qwiic (I2C)
• Runtime: running continuously for about 1 month

So far no critical issues observed in normal operation.

I plan to continue testing and can help maintain/support this board if needed.

[mokjpn]

I have continued maintaining an updated Nesso N1 branch based on this original work, because this PR became difficult to merge after the ESP32-C6 / Arduino 3.x upstream changes.

Current maintained branch:
https://github.com/mokjpn/meshtastic-firmware/tree/wip/arduino-nesso-n1

Current status:

• updated to current meshtastic/firmware develop
• pio run -e arduino-nesso-n1 builds successfully
• HAS_WIRE=1 is included for I2C buttons and external I2C sensors
• LoRa / display / BLE / physical buttons / touchscreen support are preserved
• QMP6988 support has been split out into smaller upstream PRs:
  • firmware: Add QMP6988 environmental telemetry support #10279
  • protobufs: Add QMP6988 telemetry sensor type protobufs#921

I am keeping this as a maintained downstream branch for now, while trying to split out upstreamable pieces where possible.

[vidplace7]

Closing this one for now.

Would welcome @fukuen or @mokjpn resubmitting this work rebased on develop (with pioarduino changes)