[Ai Bot] Add user token tracking, custom AI personas, max context posts, document loading, custom API URLs, and localized chat titles

Hello everyone!
I would like to suggest a few useful features for the Discourse AI plugin:

Tracking token usage per user
This would allow admins to monitor how many tokens each user is consuming when interacting with the AI. It could help prevent abuse and allow setting per-user or per-group token limits. Seeing detailed token usage breakdown by user would give better insight into usage patterns and costs.
Russian language is used by us in our community to chat with AI, but the OpenAI tokenize…

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