404Dev Docs Updated: FastAPI, API v2 & Monitoring

📖 DOCUMENTATION

New Documentation Files

• FASTAPI_MIGRATION.md - Complete migration guide
• API_V2_MIGRATION_SUMMARY.md - v2 migration details
• INTEGRATED_API_SETUP.md - Single-process setup guide
• MONITORING_GUIDE.md - Complete monitoring documentation
• MONITORING_QUICK_START.md - 5-minute monitoring setup
• SWAGGER_UI_GUIDE.md - Enhanced Swagger UI features
• OPENAPI_ENHANCEMENTS.md - OpenAPI configuration details

Updated Documentation

• README.md - Updated with v2 information
• FASTAPI_MIGRATION.md - Reflects threading model