claude-code: fix voice mode native module load on Linux

The bun-compiled binary embeds audio-capture.node (cpal + alsa-rs),
which dlopens libasound.so.2 at runtime. Because the native module
lives inside bun's virtual filesystem, autoPatchelfHook can't reach it
during the build, so on Linux the load fails and /voice prints the
"install SoX" fallback message.

Expose alsa-lib via LD_LIBRARY_PATH so the native module loads.

pkgs/by-name/cl/claude-code/package.nix

@@ -9,6 +9,7 @@
   installShellFiles,
   makeBinaryWrapper,
   autoPatchelfHook,
+  alsa-lib,
   procps,
   ripgrep,
   bubblewrap,
@@ -56,7 +57,9 @@ stdenv.mkDerivation (finalAttrs: {
       --set-default FORCE_AUTOUPDATE_PLUGINS 1 \
       --set DISABLE_INSTALLATION_CHECKS 1 \
       --set USE_BUILTIN_RIPGREP 0 \
-      --prefix PATH : ${
+      ${lib.optionalString stdenv.hostPlatform.isLinux ''
+        --prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [ alsa-lib ]} \
+      ''}--prefix PATH : ${
         lib.makeBinPath (
           [
             # claude-code uses [node-tree-kill](https://github.com/pkrumins/node-tree-kill) which requires procps's pgrep(darwin) or ps(linux)