chore: Twitter search switch

[odilitime]

Risks

Low

Background

What does this PR do?

reads and respects TWITTER_SEARCH_ENABLE (from .env or character json)

What kind of change is this?

Improvements (misc. changes to existing features)

Why are we doing this? Any context or related work?

So users don't have to edit source to enable this feature

Documentation changes needed?

My changes require a change to the project documentation.

[odilitime]

screenshots for the record