Google ADK and MCP tool Integration (US-3.2) - 3 SP

[sainijit]

User story
As a developer, I want to register google adk dynamically and invoke Kiosk Core backend APIs, so that the agent can add items to carts and look up recommendations.

Affected Components / Files

• rag-service/

Key Technical Tasks

• Define @tool wrappers: place_order, get_upsell_suggestions, get_cart, etc.
• Build executor translating tool calls to REST requests.

Acceptance Criteria

• Dynamic tool loader reads config and exposes tools. Executing place_order correctly triggers Kiosk Core cart endpoints.

Estimate: 3 SP