Version was showing as "dev" instead of "v1.5.14" because ldflags
targeted the wrong variable. Changed from internal/version.Current
to main.version which is the variable actually used by cmd/explorer.
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