…verhaul

Core Model Redesign:
- Add TbFirewallRuleReq struct with Ports field supporting comma-separated multiple ports/ranges
- Refactor TbFirewallRuleInfo to use single Port field for individual rule representation
- Add comprehensive response models: TbSecurityGroupUpdateResponse, TbRestWrapperSecurityGroupUpdateResponse, TbUpdateSummary
- Add MciAssociatedResourceList struct for complete MCI-resource relationship tracking

Backend Logic Enhancement:
- Implement ConvertFirewallRuleRequestObjToInfoObjs for flexible multi-port request conversion
- Major UpdateFirewallRules refactor with CSP-aware conditional processing (sequential for NCP, parallel for others)
- Add UpdateMultipleFirewallRules with goroutine-based parallel processing and comprehensive error handling
- Enhance diffFirewallRules with duplicate removal and default rule protection logic
- Improve ICMP protocol handling and port validation with proper empty port support
- Add GetMciAssociatedResources for complete MCI resource dependency analysis

REST API Complete Redesign:
- Remove TbFirewallRulesWrapper, standardize on TbSecurityGroupUpdateReq across all endpoints
- Comprehensive POST/DELETE firewall rule API redesign with detailed Swagger documentation
- Add RestGetMciAssociatedResources and RestPutMciAssociatedSecurityGroups for MCI-level operations
- Implement unified response format with TbSecurityGroupUpdateResponse for consistency
- Add clear REST semantics: POST for adding rules, DELETE for removing specific rules, PUT for replacing all rules

Infrastructure & Documentation:
- Add new API endpoint routing and comprehensive Swagger documentation updates
- Support batch operations with detailed success/failure tracking and summary reporting
- Enhanced error handling with provider-specific processing strategies for improved stability

Signed-off-by: Seokho Son <shsongist@gmail.com>