feat: database-first refactor, unified architecture and visual developer manual

Summary of changes:
- Consolidated Studio+CMS and Experience+LMS into unified services.
- Moved core business logic (enrollment, grading, auth) to PostgreSQL functions.
- Implemented advanced auditing via DB triggers and session context.
- Added gamification (XP/Levels/Leaderboards) and logic encapsulation.
- Updated installation/diagnostic scripts for the new architecture.
- Created a comprehensive Visual Developer Manual in README.md with hardware scaling.

diagnose_auth.sh

@@ -35,7 +35,7 @@ fi
 
 echo ""
 echo "3. Verificando JWT_SECRET en el contenedor..."
-JWT_SECRET=$(docker exec openccb-1-cms-service-1 env | grep JWT_SECRET | cut -d'=' -f2)
+JWT_SECRET=$(docker exec openccb-studio-1 env | grep JWT_SECRET | cut -d'=' -f2)
 echo "JWT_SECRET actual: $JWT_SECRET"
 
 echo ""