chore: fix gitignore pattern to exclude build artifacts

Update .gitignore to properly ignore dist directories at any level by
changing /dist to **/dist pattern. Also remove previously tracked
.astro/types.d.ts file which should not be in version control.

- Fix: Change /dist to **/dist to match nested dist directories
- Remove: apps/frontend/.astro/types.d.ts from tracking
- Ensures build artifacts are properly excluded across the project

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

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

apps/frontend/.astro/types.d.ts

@@ -1 +0,0 @@
-/// <reference types="astro/client" />