feat: classify USB-direct controllers by interface descriptor, not a VID:PID allowlist

[emir-hasanbegovic]

Problem

USB Direct mode recognized a controller only if its exact VID:PID was in the native device table. An XInput controller under an unlisted PID — e.g. an 8BitDo Ultimate 2.4g dongle in X-input mode — fell through to the generic-HID guess and failed to claim (silent garbage or a probe timeout), even though the OS xpad driver handles it fine (which is why it works in Moonlight). The table already held ~200 XInput/GIP rows that all map to the same two parsers — encoding one bit the interface descriptor states directly.

Separately, the Kotlin side claimed the first HID/vendor interface with an interrupt-IN, which on a composite Xbox 360 controller can be the audio interface (0x5D/0x03) rather than the gamepad.

Fix — classify by the USB interface descriptor, not a VID:PID allowlist

• usbparsers::classifyDevice(vid, pid, class, subclass, protocol) (pure, host-tested): a known-table entry still wins (so every listed device keeps its exact parser/init/quirks and the Sony/Switch vendor report formats); otherwise the descriptor decides — 0xFF/0x5D/0x01 → XInput, 0xFF/0x47/0xD0 → Xbox One GIP (power-on), class 0x03 → HID.
• Plumb the interface triple through attachUsbDevice (Kotlin → JNI → usbhost::attachDevice).
• Ranked interface selection so the gamepad interface is chosen over the Xbox 360 audio/expansion (0x5D/0x02, 0x5D/0x03) and security (0xFD) interfaces, which are never claimed.

Any standards-compliant wired XInput / GIP / HID controller now works in Direct mode without a table entry; the 8BitDo dongle is a consequence, not a special case, and its rumble + analog triggers come with the XInput path (which the DInput path can't express). Everything is sourced from the Linux xpad driver and [MS-GIPUSB] — no guessed bytes.

Auto-claim is unchanged: isVerifiedFastLane still keys on the kKnown table only, so descriptor-classified devices are reached only through an explicit Direct pick (dashboard / wizard "Try Direct"), never auto-claimed.

Tests

• 6 C++ classifyDevice cases (usb_parsers_test.cpp): table-wins-over-descriptor, wired XInput / GIP / HID by triple, the 8BitDo dongle triple → XInput without a table entry, unknown-vendor fallback.
• Kotlin disambiguation test (UsbGamepadManagerTest.kt): a composite Xbox 360 device enumerated audio-first must claim the gamepad interface — verified to fail against the old first-match selection.
• Full local CI green: clang-format, ktlint, detekt, lint, testDebugUnitTest, nativeTest (174/174), assembleDebug.

Scope (deliberate, not hacked)

Out of scope because doing them correctly needs the physical hardware to verify (shipping a guessed implementation would violate the "no guessing" bar): the Microsoft Xbox 360 wireless-receiver (0x5D/0x81) presence/unwrap state machine, and deeper HID multi-report muxing. Existing table entries for those keep working unchanged.