Allow using onboard PRG/Boot button (GPIO 0) for DetectionSensor module on Heltec LoRa32 V4

[SatoshiMota]

Device Hardware

• Board: Heltec LoRa32 V4 (ESP32-S3)

Description of the Goal

I am trying to build a hardware "panic button" alert system using two Heltec V4 nodes.

• Node 1 (Remote): Should act as a battery-powered remote trigger. When the physical button is pressed, it should immediately broadcast an alert signal over LoRa using the DetectionSensor module.
• Node 2 (Stationary): Acts as an MQTT gateway, receives the LoRa packet, and pushes it to a local MQTT broker on my PC.

To keep the setup as compact as possible, I want to use the built-in onboard PRG (Boot) button, which is hardwired to GPIO 0 on the Heltec V4 board, instead of soldering external switches.

The Problem / Current Behavior

Currently, the firmware blocks any attempt to use GPIO 0 for the DetectionSensor module:

1. I disable the system button functionality by setting device.button_gpio to 255.
2. I then try to assign the sensor module to the PRG button using:
   meshtastic --set detection_sensor.monitor_pin 0 --set detection_sensor.detection_trigger_type LOGIC_LOW
3. Upon reboot, the firmware automatically sanitizes/wipes these settings from the configuration (monitor_pin 0 disappears, and the trigger type reverts to default).
4. Pressing the PRG button either triggers a hard reset or causes the board to shut down/freeze due to low-level hardware/firmware handling of GPIO 0.

Requested Feature / Solution

Please unlock GPIO 0 or add an option to safely release it from the system core so it can be utilized as a regular input pin for the DetectionSensor module on Heltec LoRa32 V3/V4 devices when device.button_gpio is explicitly disabled.

Thank you!