docs: Update Opik intergration docs

[vincentkoc]

Summary

• update top-level README to explicitly call out Opik in observability features
• keep the update concise and aligned with existing feature-summary text

Test Plan

• docs-only change
• verified README renders and wording remains consistent with current feature list

[gemini-code-assist]

Summary of Changes

Hello @vincentkoc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the project's main documentation by integrating 'Opik' into the list of supported observability features. The change aims to provide a more comprehensive and up-to-date overview of the platform's capabilities for users, without altering the core functionality or code.

Highlights

• Documentation Update: Explicitly called out 'Opik' as an observability feature within the top-level README.md file.
• Consistency: Ensured the update remained concise and aligned with the existing feature-summary text in the README.

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Changelog

• README.md
  • Updated the description of observability features to include 'Opik' alongside Langfuse and Arize Phoenix.

Activity

• The change is documentation-only, ensuring no impact on the application's runtime behavior.
• The author verified that the README renders correctly and the new wording is consistent with the existing feature list.

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[gemini-code-assist]

Code Review

This pull request updates the main README.md to highlight some of the observability features Dify supports. The change is good, but the list of examples could be improved for clarity and completeness. I've suggested adding LangSmith, as it's a major supported provider, and clarifying the relationship between Arize and Phoenix. This will give new users a better overview of Dify's capabilities.