Add explicit USB wake control

[adamshiervani]

Adds a no-signal Try to wake control that sends a dedicated wake-only HID signal, while regular keyboard and mouse reports stay blocked during suspend or no-signal states.

Covers the behavior with S3 E2E tests for both ignored browser input and successful button-triggered wake, with the full E2E suite passing.

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Note

Medium Risk
Adds a new wakeHost RPC that drives a dedicated wake-capable HID function and changes HID wake settings, which can impact suspend/resume behavior and USB gadget enumeration.

Overview
Adds an explicit USB wake path by introducing a dedicated vendor HID function (wake_hid on /dev/hidg3) with wakeup_on_write=1, while disabling wakeup_on_write for the normal keyboard and mouse HID functions.

Exposes this via a new JSON-RPC method wakeHost (toggling the wake report a few times) and wires it to a new “Try to wake” button on the no-signal video overlay (with new localized strings).

Updates E2E coverage to validate S3 behavior: browser/regular HID input does not wake the host, and waking works via the overlay button and the explicit wakeHost RPC; remote-agent health() now supports a timeout to make these checks more reliable.

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