Draft: Save AI messages to PostgreSQL alongside Redis (lulalala)

Mark Chaorequested to merge
501145-save-ai-messages-to-postgress-lulalala into master

What does this MR do and why?

Save AI messages to PostgreSQL alongside Redis

  • Implements dual storage for AI messages in both Redis and PostgreSQL
  • Maintains current behavior of the Redis storage
  • Introduces duo_chat_storage_postgresql FF for managing the switch to Postgresql

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Related to #501145 (closed)

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