Use new client manager for Apps SDK

[chelojimenez]

Note

Switches OpenAI Apps component rendering to use tool definition metadata, plumbs metadata and serverId through the UI, and adds server-side caching/exposure of tools metadata.

• Frontend
  • Chat: Fetch and aggregate toolsMetadata via listTools, pass to Message/ToolCallDisplay; include serverId in tool execution when only one server is connected.
  • Tool Rendering: Replace result-based extraction with definition-based _meta["openai/outputTemplate"] for rendering Apps components in ToolCallDisplay and ResultsPanel; propagate toolMeta and serverId to OpenAIComponentRenderer.
  • ToolsTab: Derive toolMeta from loaded tools; drive UI toggles (Component/Raw/Structured) based on _meta; pass toolMeta to results panel.
• Backend
  • GET /api/mcp/tools/list (POST handler) now returns {...ListToolsResult, toolsMetadata} from server-side cache.
  • Client Manager: Cache per-server tool _meta on listTools/getTools; expose getToolMetadata/getAllToolsMetadata; clear cache on reset/disconnect.
  • Minor formatting/URL handling tweaks in connect route.

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