feat: task billing log add data export

[feitianbubu]

修复任务补扣和退款没有统计到数据看板上的问题

Summary by CodeRabbit

• Chores
  • Enhanced asynchronous quota tracking infrastructure for billing systems when the export feature is enabled.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: adb06738-195b-44d4-85b7-d608261f5472

📥 Commits

Reviewing files that changed from the base of the PR and between deff59a and 1a03099.

📒 Files selected for processing (1)

• model/log.go

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Walkthrough

Added conditional asynchronous quota export functionality to task billing logging. When enabled, quota values are computed and negated for refund operations, then scheduled for export via a goroutine pool without affecting existing database logging.

Changes

Cohort / File(s)	Summary
Quota Export Enhancement model/log.go	Integrated conditional async quota export in RecordTaskBillingLog that triggers when DataExportEnabled is active, computing and negating quota for refunds before scheduling export via gopool.Go.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A quota hops through the export tunnel,
Refunds get flipped with a logical funnel,
Async it goes to the pool with a spring,
Data flows free—what a beautiful thing!
No DB logs stumble, all logs stay intact, ✨
One simple change that's beautifully backed.

🚥 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: task billing log add data export' accurately describes the main change in the pull request, which adds conditional asynchronous quota export functionality to the task billing log.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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