feat: add useTimeSeconds in error log

[feitianbubu]

错误日志也增加时长记录
适合排查某些因超时而导致的错误

Summary by CodeRabbit

• Chores
  • Enhanced error logging infrastructure to automatically capture and record request duration metrics alongside all system errors. This improvement strengthens operational observability by providing better visibility into error patterns and timing correlations, enabling faster diagnosis and resolution of operational issues. Results in more effective system monitoring, debugging, and incident response processes.

[coderabbitai]

Walkthrough

Added time import and instrumented error logging in the processChannelError function to record actual request duration instead of zero, by extracting the request start time from context and calculating elapsed seconds.

Changes

Cohort / File(s)	Summary
Error logging instrumentation controller/relay.go	Added time import and modified processChannelError to compute and pass actual request duration (calculated from context start time) to error log recording instead of hardcoded zero value.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A hop, a skip, through time we track,
When errors come, we've got their back,
No more zeros, truth we tell,
Request durations ringing bell! 🔔

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add useTimeSeconds in error log' directly and specifically describes the main change: adding duration tracking to error logging.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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