Fix legacy assets not being cached
Fix legacy assets not being cached

When `session_start()` is called, an `Expires` header is set to a value
in the distant past. This causes Cloudflare to not cache the assets. We
should not be starting a session or authenticating for asset routes.

lightster/lidsys-web,lightster/lidsys-web,lightster/lidsys-web,lightster/lidsys-web