- Introduced `AllowLocalhostUnauthenticated` flag allowing unauthenticated requests from localhost.
- Updated authentication middleware to bypass checks for localhost when enabled.
Add new Gemini CLI models and update model registry function
- Introduced `GetGeminiCLIModels` for updated Gemini CLI model definitions.
- Added new models: "Gemini 2.5 Flash Lite" and "Gemini 2.5 Pro".
- Updated `RegisterModels` to use `GetGeminiCLIModels` in Gemini client initialization.
- Introduced OpenAI compatibility configurations for external providers, enabling model alias routing via the OpenAI API format.
- Enhanced provider logic in `GetProviderName` to handle OpenAI aliases and added new helper functions for compatibility checks.
- Updated API handlers and client initialization to support OpenAI compatibility models.
- Improved resource cleanup across clients by closing response bodies and streams using deferred functions.
