Add NHN Cloud API integration with async task support

- NHN Cloud API packages: token, vpc, compute, nks, storage
- REST API endpoints with Swagger documentation
- Async task processing for long-running operations
- CORS configuration for frontend integration
- Enhanced logging for debugging API calls

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -130,6 +130,7 @@ celerybeat.pid
 
 # Environments
 .env
+.env.*
 .venv
 env/
 venv/
@@ -174,3 +175,15 @@ cython_debug/
 # PyPI configuration file
 .pypirc
 
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# macOS
+.DS_Store
+
+# Keys (do not commit real keys)
+keys/*.pem
+!keys/.gitkeep