fix: keep Pocket DS dual screen desktop-only

[pacoa-kdbg]

Summary

• Add AYANEO Pocket DS dual-screen metadata in the same style as AYN Thor: primary/top panel on DSI-1, secondary/bottom panel on DSI-2, touchscreen names, and shared ARMADA_PANEL_ORIENTATION=left.
• Keep Game Mode primary-panel-only by inhibiting the lower Goodix touchscreen in the Steam/gamescope session and explicitly disabling the secondary KScreen output during desktop → Game Mode handoff.
• Keep Desktop Mode dual-screen by making desktop-bootstrap re-run setup-dual-screen for dual-screen devices and by having setup-dual-screen enable and rotate both outputs before positioning them.
• Make missing touchscreen devices non-fatal so display layout still succeeds if the lower Goodix device probes late or is absent.

Companion PR

• Kernel/DTS/backlight side: fix: switch Pocket DS lower panel to ST7703 armada-packages#10
• This userspace PR expects the companion kernel/package PR so the Pocket DS lower DRM connector/backlight path exists and powers down correctly.

Test Plan

• python3 -m py_compile system_files/usr/libexec/armada/setup-dual-screen
• bash -n system_files/usr/libexec/armada/session-control system_files/usr/libexec/armada/desktop-bootstrap system_files/etc/gamescope-session-plus/sessions.d/steam system_files/usr/libexec/armada/device-env
• git diff --check
• for test_file in tests/*-test.sh; do bash "$test_file"; done
  • Pocket DS desktop-only dual-screen checks passed
  • powerbutton resume and cleanup test passed
  • missing touchscreen is non-fatal

Live Pocket DS validation

Validated with the companion kernel hotfix on real AYANEO Pocket DS hardware:

• Game Mode:
  • DSI-2: disabled / DPMS Off
  • sy7758-backlight: bl_power=4
  • lower Goodix touch: inhibited
  • physical result: lower screen/backlight dark
• Desktop Mode:
  • DSI-1: enabled / On
  • DSI-2: enabled / On
  • sy7758-backlight: bl_power=0
  • lower Goodix touch: uninhibited
  • physical result: bottom screen lit and correctly oriented

Notes

• PR CI validates the image build. Publishing/signing/installability still follows the repository workflow policy for PR events.
• Temporary broad sudo used during live validation was removed after testing.

[pacoa-kdbg]

This still requires testing

[pacoa-kdbg]

Done with personal testing, ready for someone else tomorrow