…hance API documentation

🚀 Performance Improvements:
- Implement parallel VM validation in ReviewMciDynamicReq using goroutines with semaphore control (maxConcurrency: 10)
- Add concurrent resource rollback with enhanced error handling and progress tracking
- Reduce MCI review response time significantly for multi-VM configurations

📚 API Documentation Enhancement:
- Add comprehensive Swagger documentation for 8 REST API handlers in provisioning.go
- Include detailed descriptions, parameter explanations, and response examples
- Document failure policies, resource requirements, and VM lifecycle management

🔧 Core Functionality Improvements:
- Add PolicyOnPartialFailure support (continue/rollback/refine) for better failure handling
- Enhance error messages with detailed context and troubleshooting information
- Implement structured VM creation error tracking with MciCreationErrors model
- Refactor CreateMci function for better modularity and error handling

🎨 Code Quality & Structure:
- Extract helper functions for better code organization and reusability
- Add thread-safe resource summary tracking with concurrent updates
- Improve logging with detailed progress information and error context
- Enhance validation logic with early error detection and detailed reporting

📊 Model & Schema Updates:
- Add new failure policy constants and validation structures
- Extend TbMciReq and TbMciInfo models with enhanced error tracking
- Update Swagger schemas with comprehensive field documentation

🧪 Stability & Reliability:
- Add proper synchronization using sync.WaitGroup and channels
- Implement graceful error handling in parallel processing scenarios
- Add resource cleanup safeguards with detailed rollback logging
- Ensure order preservation in parallel VM validation results

This update significantly improves MCI provisioning performance while maintaining comprehensive error handling and providing better user feedback through enhanced API documentation.