Add Libre Computer La Frite (AML-S805X-AC) hardware platform support

[Copilot]

Adds LC_LAFRITE as a new hardware profile for the Libre Computer "La Frite" (AML-S805X-AC) board with a standard USB camera.

Changes

• src/seedsigner/hardware/io_config.json — New LC_LAFRITE profile:
  • Detection regex: libre computer aml-s805x-ac (matches /proc/device-tree/model)
  • Display (Waveshare HAT at same physical positions as RPi): DC=480 (GPIOX_0, pin 22), RST=510 (GPIOAO_9, pin 13), BL=495 (GPIOX_15, pin 18); SPI bus 0, device 0
  • Buttons: pull_up bias at Waveshare-compatible physical pin positions (pins 29–40), using AML-S805X-AC sysfs global GPIO numbers (482–498)
  • Camera: /dev/video0, 1280×720, YUYV, 4 fps
• docs/io_config.md — LC_LAFRITE row added to the hardware profile mapping table
• docs/hardware_platform_support.md — LC_LAFRITE added to supported profiles list with full per-pin documentation
• tests/test_io_config_profiles.py — 5 new tests: runtime detection, profile→shortname mapping, display pins, button pins, camera config

No screenshots — no UI changes.

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Documentation
• Other

Checklist

• I've run pytest and made sure all unit tests pass before sumbitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• No, I'm a fool
• Yes
• N/A

I have tested this PR on the following platforms/os:

• Raspberry Pi OS Manual Build
• SeedSigner OS on a Pi0/Pi0W board
• Other

Note: Keep your changes limited in scope; if you uncover other issues or improvements along the way, ideally submit those as a separate PR. The more complicated the PR the harder to review, test, and merge.

Warning

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• docs.google.com
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• hub.libre.computer
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• libre.computer
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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