Add missing integrations to the Python and TypeScript landing pages (#5139)

Each SDK landing page lists every entry in the IntegrationsGrid data for
that SDK, including the ones that link off-site. Two entries were added to
integrations-data.json without a matching bullet:

- Langfuse (Python), added in #5086
- LangSmith (TypeScript), which also has a local guide and a sidebars.js
  entry

Go, Java, and Ruby were already in sync.

Author: DABH

docs/develop/python/index.mdx

@@ -89,6 +89,7 @@ From there, you can dive deeper into any of the Temporal primitives to start bui
 - [Deep Agents integration](/develop/python/integrations/deepagents)
 - [Google ADK integration](/develop/python/integrations/google-adk)
 - [Google GenAI integration](/develop/python/integrations/google-genai)
+- [Langfuse integration](https://langfuse.com/integrations/frameworks/temporal)
 - [LangGraph integration](/develop/python/integrations/langgraph)
 - [LangSmith integration](/develop/python/integrations/langsmith)
 - [OpenAI Agents SDK integration](https://github.com/temporalio/sdk-python/blob/main/temporalio/contrib/openai_agents/README.md)

docs/develop/typescript/index.mdx

@@ -87,6 +87,7 @@ Once your local Temporal Service is set up, continue building with the following
 ## [Integrations](/develop/typescript/integrations)
 
 - [Braintrust integration](https://www.braintrust.dev/docs/integrations/sdk-integrations/temporal#typescript)
+- [LangSmith integration](/develop/typescript/integrations/langsmith)
 - [Mastra integration](https://mastra.ai/guides/deployment/temporal)
 - [OpenAI Agents SDK integration](/develop/typescript/integrations/openai-agents)
 - [Parseable integration](https://github.com/parseablehq/temporal-plugin/blob/main/INTEGRATION.md)