Remove committed SSL certificates (localhost+2.pem, localhost+2-key.pem)

## Problem

SSL certificate files (`localhost+2.pem` and `localhost+2-key.pem`) were committed in c0f89a2. These are local development certificates (generated by mkcert) and should not be tracked in version control.

## Proposed fix

1. Remove `localhost+2.pem` and `localhost+2-key.pem` from the repository
2. Add `*.pem` to `.gitignore` to prevent future accidental commits