- Add SSEViewer component for interactive SSE message inspection
* Display SSE data stream with collapsible panels
* Show parsed JSON with syntax highlighting
* Display key information badges (content, tokens, finish reason)
* Support copy individual or all SSE messages
* Show error messages with detailed information
- Support Ctrl+V to paste images in chat input
* Enable image paste in CustomInputRender component
* Auto-detect and add pasted images to image list
* Show toast notifications for paste results
- Add complete i18n support for 6 languages
* Chinese (zh): Complete translations
* English (en): Complete translations
* Japanese (ja): Add 28 new translations
* French (fr): Add 28 new translations
* Russian (ru): Add 28 new translations
* Vietnamese (vi): Add 32 new translations
- Update .gitignore to exclude data directory
