[Feature Request] Add Simplified Chinese language support (添加简体中文语言支持)

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Feature Request / 功能需求

Please consider adding Simplified Chinese (zh-CN) language support to Stack Wallet.

请考虑在 Stack Wallet 中添加简体中文支持。

Details / 详细说明

• Current Situation: The app currently lacks a complete/up-to-date Simplified Chinese translation.
• Expected Outcome: Users can select Simplified Chinese in the language settings.
• Contribution: If the project uses Weblate, Crowdin, or local translation files (e.g., .json / .arb), I would be happy to help translate or review the Chinese language files for the community!

Thank you for your awesome work on Stack Wallet!