Translate Korean UI text to English in OpenAIChat.js

Update OpenAIChat.js to display search results and update static build

feat(frontend): switch OpenAI chat to Vision RAG; wire image base64 to /api/vision-rag/query; add searchType/objectId/class_name and n_results; build and sync to static/

chore: rebuild frontend and sync to static

Add frontend source code structure for direct development