Gradio API migration, training pipeline, news page, and UI improvements
- Migrate backend from REST API to Gradio @gradio/client for generation - Fix Gradio parameter alignment (positions 36-49) for reference/cover audio - Add LoRA training pipeline with dataset upload, preprocessing, and export - Add News page with dismiss/restore and GitHub star button - Add localization info icon in Settings language section - Fix upload audio URL prefix, add missing MIME types - Add training API routes and Python preprocess script - Update i18n with news keys for all languages
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