Adopt registered pid.codes identities for virtual HID profiles

[ReenigneArcher]

Describe the Bug

This issue tracks adoption of the product IDs requested in pidcodes/pidcodes.github.com#1260.

The changes must not be made until that PR is accepted and merged. Once allocated, libvirtualhid should replace its temporary identities with the registered IDs so operating systems and consumers such as Sunshine can distinguish each virtual device profile reliably.

Expected Behavior

After the pid.codes PR is merged, libvirtualhid should use these identities:

VID:PID	Profile
1209:4C56	Generic Controller
1209:4C57	Keyboard
1209:4C58	Mouse
1209:4C59	Touchscreen
1209:4C5A	Trackpad
1209:4C5B	Pen Tablet

The identities should be consistent across supported backends, tests, documentation, validation tools, and downstream consumers.

Additional Context

Implementation checklist:

• Wait for the allocation PR to merge and verify the final assigned values.
• Update the built-in profiles in src/core/profiles.cpp.
• Audit and update hard-coded identity expectations in unit, backend, consumer, broker, and installed-driver tests.
• Update Windows browser and installed-driver validation scripts for the Generic Controller identity.
• Update public documentation that describes the Generic profile identity.
• Coordinate Sunshine integration so it consumes the registered profiles without relying on temporary identifiers.
• Update gamepad-helper and the gamepad tester to recognize the new Generic Controller identity in Firefox- and Chromium-style Gamepad.id strings. Retain recognition of the previous identity for older libvirtualhid installations where practical.
• Document the identity migration because Steam, SDL, browsers, or other applications may treat the updated profiles as newly connected devices and reset per-device configuration.
• Validate the affected profiles with the MinGW/UCRT64 test suite, Linux backend/consumer tests, installed Windows driver checks, and live Steam, Firefox, and Chromium testing.