prompt guard supported endpoints

[jbaross]

Jobs to be done (optional)

Followup from 5144

• Include an exhaustive list of supported endpoints
• The config reference here also seems odd since genai_category seems to allow audio input which you could not apply a regex to

Size

• S (Small). Example: fixing a broken link, updating wording in an FAQ or paragraph
• M (Medium) Example: writing a UI how to for a straightforward product, adding a plugin example