feat: Add Chinese Localization Support

[2466703125-ui]

Chinese Localization Changes

Features

• Character name language switch (Japanese/English/Chinese)
• Complete UI Chinese translation (408+ items)
• Costume name translation support
• Chinese font support and Fallback settings

New Files

• Assets/Scripts/LocalizationManager.cs - Localization manager
• Assets/Scripts/LocalizedLabel.cs - UI translation component
• Assets/Resources/Localization/zh_cn.json - Chinese translation
• Assets/Resources/Localization/en.json - English translation
• Assets/Scripts/Editor/ - 8 Editor tool scripts
• Assets/Fonts/ChineseChars.txt - Chinese character set

Modified Files

• Assets/Scripts/Settings/UISettingsOther.cs - Add character language selector
• Assets/Scripts/UmaViewerUI.cs - UI refresh logic
• Assets/Scripts/UmaViewerMain.cs - Translation file loading

Usage

1. Go to Other settings panel
2. Find Character Name Language dropdown
3. Select language: Japanese, English, Chinese