fix: fetch model add header passthrough rule key check

[feitianbubu]

修复当渠道配置请求头透传模板时, 获取模型列表失败的问题


修复后

Summary by CodeRabbit

• Refactor
  • Improved header handling logic in channel relay operations by introducing a new public interface for header pass-through rule validation, enabling more modular header processing workflow.

[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: 3cb6eabd-9c6c-46e6-8668-21e5276a37cb

📥 Commits

Reviewing files that changed from the base of the PR and between 56c9716 and 1b85b18.

📒 Files selected for processing (2)

• controller/channel.go
• relay/channel/api_request.go

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Walkthrough

The PR exposes an existing private header passthrough rule check function as a public API in the relay channel module and uses it in the channel controller to skip processing passthrough rule headers when building fetch models headers.

Changes

Cohort / File(s)	Summary
Header Passthrough Rule Exposure relay/channel/api_request.go	Added public wrapper function IsHeaderPassthroughRuleKey(key string) bool that delegates to the existing internal isHeaderPassthroughRuleKey(key) function.
Channel Controller Integration controller/channel.go	Added import alias for relay channel module and integrated the new IsHeaderPassthroughRuleKey function to skip processing passthrough rule header keys in buildFetchModelsHeaders.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• #2394 — Both changes modify header handling in controller/channel.go for fetching upstream models; this PR uses the newly exposed IsHeaderPassthroughRuleKey to skip passthrough headers while the related PR adds header override functionality.
• #2840 — Directly related through shared header passthrough logic in relay/channel/api_request.go; this PR exposes the key check function while the related PR manages extensive header passthrough rule additions.

Poem

🐰 A hidden check now sees the light,
Exported from the shadows bright,
Controller calls it by its name,
Headers skip—it plays the game! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% 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 clearly and specifically describes the main fix: adding a header passthrough rule key check to the fetch model functionality.

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