feat: add email integration with mu4e and protonmail-bridge

- Configure mu4e in Doom Emacs with Proton mail account
- Add protonmail-bridge service and mbsync/msmtp for mail sync
- Integrate sops-nix for secrets management (mail password)
- Create mail.nix with full IMAP/SMTP configuration
- Add ComfyUI user service module
- Add custom ASCII banner for Doom dashboard
- Enable nix module in Doom Emacs
- Add force-quit gnome extension
- Ignore secrets directory in git
- also add comfy-ui

home-manager/emacs/default.nix

@@ -21,6 +21,8 @@
     emacsPackages.vterm
     emacsPackages.treemacs
     emacsPackages.doom
+    emacsPackages.mu4e
+    mu
     sbcl
   ];