- Introduced a new system store management feature, allowing for the loading of predefined system stores such as cache and OAuth client stores.
- Added a `loadSystemStores` function to handle the loading of system stores with variable replacement for configuration paths.
- Enhanced the `Load` function to include the loading of system stores, improving the overall store management process.
- Updated test utilities to support loading system stores for testing, ensuring comprehensive coverage and functionality.
- Refactored the `replaceVars` function to facilitate variable replacement in JSON strings, enhancing flexibility in store configurations.
- Updated the SigningConfig, TokenConfig, SecurityConfig, and ClientConfig structures to include optional default values for various fields, improving clarity and usability.
- Added comments to specify default values and optionality for each configuration parameter, enhancing documentation within the code.
- This change aims to streamline the configuration process for OAuth service implementations.
