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2e928c3b94
docs: update media examples and add parameter details for TTS providers - Updated EdgeTTS example to mention additional audio parameters (`rate`, `volume`, `pitch`) - Updated gTTS example to include support for `tld` and `slow` audio parameters - Modified the EdgeTTS provider to use `get_last_message` instead of `format_image_prompt` for prompt handling - Modified the gTTS provider to use `get_last_message` instead of `format_image_prompt` for prompt handling - Refactored audio file generation logic in the gTTS provider to handle `language` parameter and update the voice model accordingly - Refactored backend API code to introduce `cast_str` function for processing responses, including cache management and response formatting - Fixed a bug in `AnyProvider` where the model string check would fail if the model was `None` - Added check in `to_string` helper function to handle `None` values correctly ```