Add jq package for project shortcuts JSON parsing

- Add jq to home.packages in zsh.nix
- Required for project-launcher.sh to parse projects.json
- Fixes 'No projects configured' error

🤖 Generated with [Claude Code](https://claude.ai/code)

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

modules/zsh.nix

@@ -101,6 +101,7 @@ in
     fd
     ripgrep
     bat
+    jq
   ];
   
   programs.fzf = {