ci: add release build workflow

[bsg62]

Summary

• Add a manual Build and Release workflow with version input
• Create a draft GitHub release and build macOS, Linux, and Windows x86_64/aarch64 binaries
• Upload raw artifacts and attach tar.gz release assets

Test Plan

• cargo fmt --manifest-path rust/Cargo.toml -- --check
• cargo clippy --manifest-path rust/Cargo.toml -- -D warnings
• cargo test --manifest-path rust/Cargo.toml

Notes

• Full release workflow validation requires manually running the workflow on GitHub with a test version.