sloproxy

feat(models): add metadata for Gemini 3.5 Flash Lite and Gemini 3.6 Flash models master

- Added detailed specifications for `Gemini 3.5 Flash Lite` and `Gemini 3.6 Flash` models, including token limits, generation methods, and thought levels. - Updated `models.json` to include entries for both versions across relevant segments. Closes: #4521


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