feat: Add LLM integration and improve Emacs configuration

- Add gptel and gptel-magit packages for AI-powered Git commits and
- chat Add org-roam and org-roam-ui for better note-taking and
- knowledge management Add benchmark-init to measure startup
- performance Add winum for window navigation with keybindings Add
- vterm for better terminal emulation Configure exec-path-from-shell
- to inherit shell environment Add org-roam.db to gitignore Set
- use-short-answers for yes/no prompts Add org-todo-list keybinding
- and update magit binding Configure org-agenda-files to include org
- directory Remove commented eat package configuration

.gitignore

@@ -1,6 +1,8 @@
 # generated by macOS
 .DS_Store
 
+org-roam.db
+
 # machine generated doom profiles or metadata
 /profiles/*.el
 /.local*/