e9c504c0d7
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Adds complete SD card image builder for the RPi Audio Mixer: - build/build.sh: Main builder (RPiOS Lite base + chroot config + optional RT kernel cross-compile) - build/configure-system.sh: Chroot configuration (packages, services, audio config) - build/first-boot/setup-wizard.sh: Interactive first-boot setup (audio, WiFi, hostname, API key, JACK) - build/README.md: Flashing instructions and build documentation - Updated .gitignore to track build scripts but ignore artifacts - Updated README.md with current project status 735/735 tests pass. Build runs on x86_64 without a Raspberry Pi.