refactor: consolidate blockchain explorer into single app and update backup ignore patterns

- Remove standalone explorer-web app (README, HTML, package files)
- Add /web endpoint to blockchain-explorer for web interface access
- Update .gitignore to exclude application backup archives (*.tar.gz, *.zip)
- Add backup documentation files to .gitignore (BACKUP_INDEX.md, README.md)
- Consolidate explorer functionality into main blockchain-explorer application

docs/1_project/aitbc.md

@@ -678,7 +678,7 @@ sudo systemctl start aitbc-*.service
 - **Services**: 26 services across 3 sites
 
 ### 🛠️ **CLI Development Environment**
-- **Development Directory**: `/home/oib/windsurf/aitbc/cli-dev`
+- **Development Directory**: `/home/oib/windsurf/aitbc/dev/cli`
 - **Testing Infrastructure**: Complete
 - **Mock Server**: Implemented
 - **Documentation**: Comprehensive