fix(freebuff): patch pre-built binary with patchelf for NixOS compatibility

- Download and extract the engine binary from codebuff.com releases
- Use patchelf to set correct glibc interpreter path
- Create wrapper launcher that copies patched binary to user config
- Pre-fetch all npm dependencies (no network needed in sandbox)
- Set dontStrip/dontPatchelf to prevent fixupPhase corruption

packages/freebuff/default.nix

@@ -1 +1 @@
-{ pkgs, ... }: pkgs.callPackage ./package.nix { }
+{ pkgs, ... }: pkgs.callPackage ./package.nix { glibc = pkgs.stdenv.cc.libc; }