fix: remplacer import atomicptr par crab.nix local

Corrige le warning d'évaluation "'system' has been renamed to
stdenv.hostPlatform.system" causé par `system = system` dans la
dérivation crab upstream.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pkgs/crab.nix

@@ -0,0 +1,43 @@
+# Based on https://github.com/atomicptr/nix/blob/master/pkgs/crab/default.nix
+# Fixed: removed deprecated `system = system` from mkDerivation
+{
+  lib,
+  fetchurl,
+  installShellFiles,
+  stdenvNoCC,
+}:
+let
+  shaMap = {
+    x86_64-linux = "18c2mxaf0f01c1905c7ppnq9cq07qr4nn5al9zn9idhzk9b8mf9q";
+    x86_64-darwin = "10w9xv7z8fw4628pwnw9dj2n3wf3g0lgfcpy3k2f3v6fhv30abwm";
+  };
+  urlMap = {
+    x86_64-linux = "https://github.com/atomicptr/crab/releases/download/v1.4.4/crab_1.4.4_linux_amd64.tar.gz";
+    x86_64-darwin = "https://github.com/atomicptr/crab/releases/download/v1.4.4/crab_1.4.4_darwin_amd64.tar.gz";
+  };
+  system = stdenvNoCC.hostPlatform.system;
+in
+stdenvNoCC.mkDerivation {
+  pname = "crab";
+  version = "1.4.4";
+  src = fetchurl {
+    url = urlMap.${system};
+    sha256 = shaMap.${system};
+  };
+  sourceRoot = ".";
+  nativeBuildInputs = [ installShellFiles ];
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -vr ./crab $out/bin/crab
+  '';
+  meta = {
+    description = "A versatile tool to crawl dozens of URLs from a given source, like a sitemap or an URL list.";
+    homepage = "https://github.com/atomicptr/crab";
+    license = lib.licenses.mit;
+    sourceProvenance = [ lib.sourceTypes.binaryNativeCode ];
+    platforms = [
+      "x86_64-darwin"
+      "x86_64-linux"
+    ];
+  };
+}