Changes
PR #1906 by ksylvan: Code Quality: Optimize HTTP client reuse + simplify error formatting
- Refactor: optimize HTTP client reuse and simplify error formatting
- Simplify error wrapping by removing redundant Sprintf calls in CLI
- Pass HTTP client to FetchModelsDirectly to enable connection reuse
- Store persistent HTTP client instance inside the OpenAI provider struct
- Update compatible AI providers to match the new function signature