<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added support for a new AES key for license management, improving license encryption and decryption processes.
- **Bug Fixes**
- Improved error messages and handling when activating expired or invalid licenses.
- **Refactor**
- Updated license decryption logic to use a fixed AES key instead of deriving one from the workspace ID.
- Added validation for environment variable values to prevent invalid configurations.
- **Tests**
- Enhanced license-related tests to cover new key usage and updated error messages.
- Updated environment variable validation tests with clearer error messages.
- **Chores**
- Updated environment variable handling for improved consistency.
- Set production environment variable explicitly in build configuration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->