fix: use default model price for radio price model

[feitianbubu]

没有配置费用，也要使用默认费用,否则按费率计费的视频模型无法使用
比如豆包视频和可灵视频

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of missing model pricing configurations. The system now gracefully falls back to a calculated default price instead of returning an error, ensuring continued operation when per-call pricing is not explicitly configured.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e71f5a4 and 4d9f92d.

📒 Files selected for processing (1)

• relay/helper/price.go

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Walkthrough

The ModelPriceHelperPerCall function in relay/helper/price.go was modified to compute a fallback default price using PreConsumedQuota / QuotaPerUnit when model price is not configured, instead of returning an error immediately. Subsequent validation logic remains unchanged.

Changes

Cohort / File(s)	Summary
Price Helper Logic relay/helper/price.go	Modified ModelPriceHelperPerCall to calculate fallback default price from PreConsumedQuota / QuotaPerUnit when model price is missing, replacing the previous error-return path.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: task pre consume modelPrice default use setting value #2733 — Implements the same fallback pricing calculation logic (PreConsumedQuota / QuotaPerUnit) instead of using a hard-coded default value for missing model prices.

Suggested reviewers

• seefs001

Poem

🐰 A price without a default was once our despair,
Now quotas divide neatly through the air,
No errors to fear, just logic so clean,
The finest fallback ever seen! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions 'radio price model' but the change is about using a default model price as a fallback for models billed by rate, specifically video models.	Update the title to accurately reflect the change, such as 'fix: use default model price when not configured for rate-based billing' or similar.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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