Replace obsolete iframe/placeholder tests with new tests covering the
hero section, connection status, quick-start card grid, disabled API
Reference card, and running agents table section.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace placeholder pages with ToolEmbed component that embeds
LangGraph, LangFlow, and Langfuse in iframes when configured, or
shows "Not Configured" placeholders when URLs are empty. Add
ServiceUrlsContext for passing service URLs through Dioxus context.
Add docker-compose services for local development: LangFlow,
LangGraph (trial), Langfuse with full dependency stack (Postgres,
ClickHouse, Redis, MinIO).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
