DS3 Bridge v1.0.0

Prebuilt release zip (static libusb) alongside the Homebrew build

- ./build.sh --release links libusb statically and packages
  dist/DS3Bridge-macOS-arm64.zip with all license texts.
- README: option A (download from Releases, no Homebrew/Xcode) and
  option B (build from source); direct link to the official Karabiner pkg.
- THIRD_PARTY_NOTICES: libusb (LGPL, static in the release) and the
  header-only libraries compiled into vhidkbd; licenses/ folder.
- ds3bt: print usage for unknown commands before checking Bluetooth.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>