Integrate Flow Builder MCP into AI Expert / Forge

**Parent Deliverable:** FlowFuse/product#47 — Expert as Agentic Co-pilot

## Context

From the March 11/13 refinement whiteboards. Andrea's Flow Builder MCP Server needs to be integrated into the AI Expert or made available hidden behind Forge (like the AI Expert itself). This requires discussion with Steve on the integration approach.

Whiteboard note: "Need to discuss with Steve on how to do it"

## Scope

- Determine integration path: embed MCP Server into AI Expert, or make it a standalone service behind Forge
- Implement the chosen integration path
- Ensure the Flow Builder MCP can be invoked by the AI Agent for flow generation tasks
- Handle authentication and authorization through Forge BE

## Dependencies

- Flow Builder MCP Server migration to bundled JSON (FlowFuse/nr-assistant — sibling issue)
- Discussion with Steve on architecture approach
- Forge BE may need new endpoints for MCP Server management

## Estimate

7h (from whiteboard refinement)

## Acceptance Criteria

- [ ] Flow Builder MCP is accessible to the AI Agent through the agreed integration path
- [ ] Auth is handled through Forge BE (no standalone credentials needed)
- [ ] AI Expert can generate flows using the MCP Server's capabilities
- [ ] Integration approach documented for maintainability