feat(home): add pass-backed keyring module and enable for work VM

- Add modules/home/security/pass-keyring with GPG agent, pass, and
  python keyring backend config for headless credential storage
- Enable pass-keyring for lin-va-mbp-work-vm
- Update bash PATH from ~/.bin to ~/.local/bin

modules/home/programs/terminal/bash/default.nix

@@ -34,7 +34,7 @@ in
       profileExtra = ''
         export COLORTERM=truecolor
         SHELL="$BASH"
-        PATH=~/.bin:$PATH
+        PATH=~/.local/bin:$PATH
         bind "set show-mode-in-prompt on"
 
         set -o vi || true