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Add a new admin-only feature that allows the platform owner to benchmark the production AI model against up to 2 alternate models (any OpenAI-compatible API) using real tenant data, without impacting users. Backend: - Shared AI caller utility (ai-caller.ts) for OpenAI-compatible endpoints - Shadow AI module with service, controller, and 3 entities - 6 admin API endpoints for model config CRUD, run trigger, and history - Auto-creates shadow_ai_models, shadow_runs, shadow_run_results tables - Exposes health-scores and investment-planning prompt builders for reuse Frontend: - New admin page at /admin/shadow-ai with 3 tabs: - Model Configuration (production + 2 alternate slots) - Run Comparison (tenant select, feature select, side-by-side results) - History (filterable run log with detail drill-down) - Full side-by-side output display with diff highlighting - Sidebar navigation link for AI Benchmarking Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>