chore: remove large installer files from git tracking

Remove 160MB installer executables from git as they exceed GitHub's
100MB file size limit. Updated .gitignore to properly exclude
windows-installer directory. Installers should be distributed via
GitHub Releases or external file sharing instead.

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

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

Author: KevenWMarkham

.gitignore

@@ -29,10 +29,8 @@ dist-ssr
 release/
 dist-electron/
 out/
-
-# Installers - exclude by default
+windows-installer/
 *.exe
-!windows-installer/*.exe
 *.dmg
 *.AppImage
 *.snap