[engine] Fix issue where NSFW boosting can be permitted front#5426

Ticket(s) / Related Merge Requests

• Issue card: front#5426 (closed)

• Front card: front!1841 (merged)

Summary of Changes

Fixes issue where attempts to boost NSFW boosting can be permitted. Adds backend validation.

Testing Considerations

Hit the prepare endpoint requesting checksum of an NSFW post.

Regression Scope

Boosting content.

Platform Affected (web, mobile, etc)

Web, may also impact mob.

Developer Testing Completed

Manual

Screenshots

(Any extra UI screens that can be shared)

Does this impact

• Localization
• Dark/light mode
• Guest mode