Add macOS aarch64 release workflow and cleanup
Add aarch64 toolchain, build, packaging, and release steps so both
x86_64 and aarch64 macOS binaries are published.
Update author contact in Cargo.toml and LICENSE. Replace the
unwrap-based GENIUS_TOKEN check with is_err to avoid panics. Tidy
ASCII art and remove some README badges and BuyMeACoffee button.