- Changed `api_base` to `base_url` in multiple provider files for consistency.
- Updated method signatures and internal references to use `base_url` instead of `api_base`.
- Adjusted the `OpenaiTemplate` class to accommodate the new `base_url` parameter.
- Enhanced the `ClientFactory` to support custom provider creation with `base_url`.
- Modified API request handling in the backend to align with the new naming convention.