Add access control and approval mechanisms

**Summary**: Implement access control and approval systems that enforce environment-specific permissions and approval workflows.

**Acceptance Criteria**:
- [ ] Environment-specific access control and permission management
- [ ] Integration with CI/CD platform approval systems
- [ ] Role-based access control for environment operations
- [ ] Approval workflow configuration and management
- [ ] Audit logging for access control and approval events
- [ ] Emergency access and break-glass procedures