docs: Add missing OpenTelemetry environment variables and @langfuse/otel package setup for JS/TS OpenAI SDK

[doongsilee]

Summary

This PR adds missing documentation for OpenTelemetry setup in the JS/TS OpenAI SDK get-started guide.

Changes

1. Added OpenTelemetry environment variables configuration (components-mdx/setup-otel-js.mdx)

   • Added OTEL_EXPORTER_OTLP_ENDPOINT configuration
   • Added OTEL_EXPORTER_OTLP_HEADERS configuration with base64 authentication
   • Included instructions for generating base64 encoded auth string using terminal command
   • This was already present in Python documentation but missing in JS/TS

2. Added @langfuse/otel package installation (components-mdx/get-started/js-openai-sdk.mdx)

   • Added @langfuse/otel to the required packages list
   • This package is required for LangfuseSpanProcessor used in OpenTelemetry setup

Context

The JS/TS OpenAI SDK integration requires OpenTelemetry environment variables to be configured, similar to the Python version. Without these environment variables, the OpenTelemetry exporter cannot properly authenticate and send traces to Langfuse, and the integration will silently fail without any error messages.

Testing

• Verified that the documentation matches the Python version structure
• Confirmed that all required packages are now listed

---

Important

Adds missing OpenTelemetry setup documentation for JS/TS OpenAI SDK, including environment variables and package installation.

• Documentation:
  • Adds OpenTelemetry environment variables OTEL_EXPORTER_OTLP_ENDPOINT and OTEL_EXPORTER_OTLP_HEADERS to setup-otel-js.mdx.
  • Provides instructions for generating base64 encoded auth string in setup-otel-js.mdx.
  • Adds @langfuse/otel package to installation instructions in get-started/js-openai-sdk.mdx.
• Context:
  • Aligns JS/TS OpenAI SDK documentation with Python version for OpenTelemetry setup.
  • Ensures proper authentication and trace sending to Langfuse.

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