fix: Resolve linter issues before AI agent implementation

Linter Fixes:
- Remove unnecessary nil check in kubernetes/adapter.go (len() handles nil maps)
- Remove unnecessary fmt.Sprintf in optimization_test.go (no placeholders)
- Fix OpenAPI YAML syntax errors and update version to 3.1.0
- Quote description strings to fix compact mapping errors

Python Dependencies:
- Install networkx in SDK virtual environment
- Install cloudsafeguard-sdk in all agent virtual environments
- Verify all imports work correctly in agent venvs

Status: ✅ Linter issues resolved
Next: Ready for AI agent implementation