- Added `GeminiGetHandler` for handling GET requests with extended Gemini model support.
- Introduced `geminiCountTokens` function to calculate token usage.
- Refactored `APIRequest` and related methods to support `alt` parameter for enhanced flexibility.
- Updated routes and request processing to integrate new handler and functions.
- Added localhost-only access restriction to `CLIHandler` for security.
- Updated README to reflect Gemini-compatible API and local access limitation notes.
- Centralized `getClient` logic into a dedicated function to reduce redundancy.
- Moved proxy initialization to a new utility function `SetProxy` in `internal/util/proxy.go`.
- Replaced `Internal` handler with `CLIHandler` in `server.go` for improved clarity and consistency.
- Removed unused functions and redundant HTTP client setup across the codebase for better maintainability.
