Summary

Implements MCP Apps support for Archestra Chat UI per MCP UI spec.

Changes (5 files, +82 lines)

• Backend (k8s-deployment.ts, manager.ts): Detect MCP servers with UI, expose as tools with mcpAppUrl
• Shared (schemas.ts): Extended AvailableToolSchema with optional mcpAppUrl
• Frontend (agent-tools-display.tsx): MCP App tools show blue APP badge, clickable to open panel
• Frontend (mcp-app-panel.tsx): New component renders MCP App in sandboxed iframe side panel

📹 Demo

Excalidraw MCP loaded in side panel:

n8n Workflow MCP loaded in side panel:

Acceptance Criteria Coverage

1. ✅ MCP Apps in Chat UI — APP badge + side panel iframe
2. ✅ MCP Gateway — mcpAppUrl in AvailableToolSchema flows through gateway
3. ✅ LLM Gateway — same schema, third-party UIs detect mcpAppUrl
4. ✅ Two vendors tested — Excalidraw + n8n

Verification

• turbo type-check passes
• Local build successful

/claim #1301

Resolves #1301