docs: add 9 new wiki pages, update 4 existing pages New pages: Sales, CRM, Usage, Wiki-RAG, Payments, Backup, Personas, API-Reference, Troubleshooting. Updated: Home (navigation table), _Sidebar (grouped navigation), Settings (profile section), Audit (cleanup API, stats). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>