[thelounge] Enable access to uploads

[BeansIsFat]

Adds api endpoint /uploads.

Description

Discord user Muppet requested that uploads be available outside of authelia when configured. https://discord.com/channels/853755447970758686/944260106852368384/1095130701524914226

How Has This Been Tested?

• [x] Tested on my production installation of The Lounge.

[owine]

Need to review impact on traefik3 branch but no issues getting this on master in the meantime.