Add Barazo Forum lexicons (forum.barazo.*)

[gxjansen]

Adds Barazo to the list. It's a forum platform on AT Protocol where topics, replies, reactions, and user preferences all live in the user's PDS.

• https://barazo.forum
• Namespace: forum.barazo.*
• Lexicon repo: https://github.com/singi-labs/barazo-lexicons
• Bluesky: @barazo.forum
• License: MIT

Lexicons

Lexicon ID	Description
forum.barazo.topic.post	Forum topic with title, content, community, category, tags
forum.barazo.topic.reply	Threaded reply with root/parent references
forum.barazo.interaction.reaction	Reaction to a topic or reply
forum.barazo.actor.preferences	User moderation and safety preferences