chore: use rtk from official package

packages.nix

@@ -14,7 +14,6 @@ let
 in
 let
   crab = pkgs.callPackage ./pkgs/crab.nix { };
-  rtk = pkgs.callPackage ./pkgs/rtk.nix { };
 in
 {
   nixpkgs.overlays = [ pythonOverlay ];

pkgs/rtk.nix

@@ -1,21 +0,0 @@
-{
-  rustPlatform,
-  fetchFromGitHub,
-  pkg-config,
-  sqlite,
-  lib,
-}:
-rustPlatform.buildRustPackage {
-  pname = "rtk";
-  version = "0.22.2";
-  src = fetchFromGitHub {
-    owner = "rtk-ai";
-    repo = "rtk";
-    rev = "5b597002dcd99029cb9c0da9b6d38b44021bdb3a";
-    hash = "sha256-a/+5w1cU/sSGsIdu/9QT1lJlURF669FxMcTiR81makE=";
-  };
-  cargoHash = "sha256-lgmgorgT/KDSyzEcE33qkPF4f/3LJbAzEH0s9thTohE=";
-  doCheck = false; # tests require filesystem access (blocked by Nix sandbox)
-  nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ sqlite ];
-}