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.

roadmap.md

@@ -155,13 +155,12 @@
 **Platform Maturity**: Core functionality is production-ready. Advanced features like AI integration are under active development.
 
 **Recent Milestones**:
+- ✅ **Gamification System**: XP, Levels, and Leaderboards integrated into the student experience.
 - ✅ **Organization Branding**: Full customization of logos and brand colors across both portals.
 - ✅ **Multi-Tenancy**: Full support for multiple organizations, from the database to the frontend.
 - ✅ **Holistic Grading System**: Weighted categories, attempt tracking, and dynamic passing thresholds.
-- ✅ **Analytics Dashboards**: Performance insights for both instructors and students.
-- ✅ **Full Content Editor**: Robust activity builder with multiple interactive block types.
 
 **Next Priorities**:
-1. **AI Integration**: Implement real-time video transcription.
-2. **Gamification**: Expand the badges and achievement system.
-3. **Advanced Analytics**: Develop cohort analysis and retention metrics.
+1. **AI Integration**: Implement real-time video transcription (external and local provider).
+2. **Advanced Analytics**: Develop cohort analysis and retention metrics.
+3. **Enterprise Ecosystem**: SSO (Single Sign-On) and Webhooks.