Add Chinese Homepage translation (alexmojaki#516)

* Add Chinese translation for homepage

- Add Chinese version of index.html in translations/locales/zh/
- Translate all UI text, testimonials, and feature descriptions
- Maintain original HTML structure and styling
- Use Simplified Chinese for accessibility to mainland users

* Fix Chinese translation issues

- Fix missing translation for 'Run' button (运行)
- Update msgid from 'frontend.chat_on_slack' to 'frontend.chat_on_discord'
- Add Chinese translation for Discord chat link
- Ensure consistency in UI terminology translations

* Add compiled Chinese translation file

- Add futurecoder.mo (compiled translation file)
- Ensures Chinese translations work immediately without recompilation
- Includes all frontend terms and UI translations

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Co-authored-by: Conner Mo <[email protected]>

Author: connermo