refactor: generalize nix-eval-flake into nix-flake wrapper (#336)

Replace the nix-eval-flake wrapper (which only supported `nix eval`)
with a generalized nix-flake wrapper that accepts any nix subcommand.
This avoids the `#` character in flake refs causing permission prompts
in Claude Code for commands like `nix build .#...`.

Usage: nix-flake <subcommand> <flake-output> [extra-args...]

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: stackptr

modules/home/development.nix

@@ -90,7 +90,7 @@ in {
               "Bash(nix show-derivation *)"
               "Bash(nix store *)"
               "Bash(nix why-depends *)"
-              "Bash(nix-eval-flake *)"
+              "Bash(nix-flake *)"
               # Git
               "Bash(git add *)"
               "Bash(git blame *)"

modules/home/utilities.nix

@@ -91,12 +91,12 @@ in {
       programs.nix-index-database.comma.enable = true;
 
       home.packages = let
-        nix-eval-flake = pkgs.writeShellScriptBin "nix-eval-flake" ''
-          nix eval ".#$1" "''${@:2}"
+        nix-flake = pkgs.writeShellScriptBin "nix-flake" ''
+          nix "$1" ".#$2" "''${@:3}"
         '';
       in
         [
-          nix-eval-flake
+          nix-flake
           pkgs.manix
           pkgs.nix-du
           pkgs.nix-tree