* 🤖 feat: `gemini-3.1-flash-lite-preview` Window & Pricing
- Updated `.env.example` to include `gemini-3.1-flash-lite-preview` in the list of available models.
- Enhanced `tx.js` to define token values for `gemini-3.1-flash-lite`.
- Adjusted `tokens.ts` to allocate input tokens for `gemini-3.1-flash-lite`.
- Modified `config.ts` to include `gemini-3.1-flash-lite-preview` in the default models list.
* chore: testing for `gemini-3.1-flash-lite` model, comments
- Updated `tx.js` to include cache token values for `gemini-3.1-flash-lite` with specific write and read rates.
- Enhanced `tx.spec.js` to include tests for the new `gemini-3.1-flash-lite-preview` model, ensuring correct rate retrieval for both prompt and completion token types.
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