feat(python): manage python with uv via nix-ld

modules/nixos.nix

@@ -54,6 +54,23 @@
   programs.hyprland.enable = true;
   programs.dconf.enable = true;
 
+  # nix-ld: install a stub dynamic linker at the standard FHS path
+  # (/lib64/ld-linux-*.so), which NixOS otherwise lacks. Lets unpatched
+  # prebuilt binaries run — notably the standalone CPython builds uv downloads
+  # and pip wheels with compiled extensions (numpy, pydantic-core, ...). The
+  # libraries list is exposed as NIX_LD_LIBRARY_PATH so those binaries find
+  # common shared libs; extend it when an import fails with "libFOO.so.N: cannot
+  # open shared object file".
+  programs.nix-ld = {
+    enable = true;
+    libraries = with pkgs; [
+      stdenv.cc.cc.lib   # libstdc++, libgcc_s, libgomp
+      zlib               # libz
+      zstd               # libzstd (pyarrow, polars)
+      openssl            # libssl, libcrypto
+    ];
+  };
+
   # Packages installed in system profile.
   environment.systemPackages = with pkgs; [
     curl