feat(ops): set root span kind for AliyunTrace to enable service-level metrics aggregation

[hieheihei]

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Summary

close #30863

Set root span kind to SERVER for AliyunTrace to enable service-level metrics aggregation in Aliyun observability backend.

The Aliyun observability backend calculates service metrics based on span kind. Setting root spans to SERVER enables proper service metrics tracking (request rate, latency, error rate).

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Before	After

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @hieheihei, 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 significantly improves the accuracy of service-level metrics aggregation within the Aliyun observability backend by correctly classifying root spans. By explicitly setting the "SpanKind" of initial traces to "SERVER", the Aliyun system can now properly track and report key performance indicators such as request rate, latency, and error rates, providing better insights into application performance.

Highlights

• Enhanced Aliyun Trace Span Kind Configuration: Introduced the "SpanKind" enum into the "SpanData" entity and updated the "traceclient" to dynamically use this "span_kind" when building spans, allowing for more granular control over span classification.
• Correct Root Span Classification for AliyunTrace: Configured root spans generated by "message_trace" and "add_workflow_span" to be explicitly set as "SpanKind.SERVER". This ensures that service-level metrics are correctly aggregated by the Aliyun observability backend.

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[gemini-code-assist]

Code Review

This pull request correctly implements the setting of SpanKind for root spans in AliyunTrace to SERVER, which will enable proper service-level metrics aggregation in the Aliyun observability backend. The changes are well-structured: the SpanData entity is extended to carry the span_kind, the trace creation logic in aliyun_trace.py correctly identifies and sets the kind for root spans, and the traceclient is updated to use this new information. The use of a default SpanKind.INTERNAL ensures that existing code continues to function as before. The implementation is clean and effectively addresses the stated goal.