- Introduced a new Gemini-compatible API with routes under `/v1beta`.
- Added `GeminiHandler` to manage `generateContent` and `streamGenerateContent` actions.
- Enhanced `AuthMiddleware` to support `X-Goog-Api-Key` header.
- Improved client metadata handling and added conditional project ID updates in API calls.
- Updated logging to debug raw API request payloads for better traceability.