Per user feedback: admin/review/ai-image-gen/ai-chat are completely new independent systems with their own codebases and DBs, not reusing existing services. They only have API-level calls between each other and to existing services. Section 1.3 table and 'key clarification' paragraph updated. Other 'shared' references in the document refer to the platform-architecture sense (shared services for all groups), not code reuse, so no other changes needed.
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