Add freebuff v0.0.85 from npm registry — a pure JS CLI tool for
AI-assisted coding. Pre-fetches all transitive npm dependencies to
work within the Nix sandbox (no network access during build).
Replace fetchurl + prebuilt binary with buildGoModule + buildNpmPackage
to compile radar natively from source. Frontend (React/Vite) is built
as a separate derivation, then embedded into the Go binary via go:embed.
Also patches the npm lockfile to add missing resolved URLs for
workspace packages that lacked them, enabling proper dependency fetching.
Closes nix-overlay-qlc
