Allow Image Uploads in AI Chat

Currently, the AI chat supports only text-based interactions. For a richer user experience, especially in skincare analysis, users should be able to upload images (e.g., selfies or product labels) directly in the chat. The AI assistant can then analyze these images contextually and provide personalized responses.

Proposed Solution:

Add image upload support in the chat UI (frontend).

Update backend API to accept multipart/form-data for chat messages.

Integrate image analysis (using existing Gemini/OpenAI image APIs).

Store image metadata in chat history for better continuity.