Verify UI Login Actions & Loyalty Prompt Injection (US-4.4) - 3 SP

[sainijit]

User story
As a customer, I want to login via camera/mic so my preferences (favorites, restrictions) are loaded and injected into the conversational prompt automatically.

Affected Components / Files

• gradio_app.py
• kiosk_core/

Key Technical Tasks

• Expose REST endpoints POST /api/v1/identity/register and verify.
• Integrate webcam capture and microphone voice login ("My voice is my password").
• Inject loyalty details into RAG prompt context.

Acceptance Criteria

• User logs in successfully via the UI. The assistant greets the user by name and respects dietary preferences (e.g., dairy-free) in chat.

Estimate: 3 SP