fix: normalize kimi k2.6 temperature

[bensonfx]

📝 变更描述 / Description

修复 Moonshot 渠道下 kimi-k2.6 请求的 temperature 处理逻辑。

kimi-k2.6 上游只接受 temperature = 1.0。本次变更在 Moonshot OpenAI 兼容请求转换阶段，根据最终上游模型名识别 kimi-k2.6，当请求显式传入非 1.0 的 temperature
时自动归一化为 1.0，避免上游返回参数错误。

未显式传入 temperature 的请求保持省略状态，其他 Moonshot 模型不受影响。

🚀 变更类型 / Type of change

• 🐛 Bug 修复 (Bug fix) - 请关联对应 Issue，避免将设计取舍、理解偏差或预期不一致直接归类为 bug
• ✨ 新功能 (New feature) - 重大特性建议先通过 Issue 沟通
• ⚡ 性能优化 / 重构 (Refactor)
• 📝 文档更新 (Documentation)

🔗 关联任务 / Related Issue

• Closes Bug: Moonshot adapter fails with 400 error for kimi-k2.6 due to unsupported temperature value #5372

✅ 提交前检查项 / Checklist

• 人工确认: 我已亲自整理并撰写此描述，没有直接粘贴未经处理的 AI 输出。
• 非重复提交: 我已搜索现有的 Issues 与 PRs，确认不是重复提
  交。
• Bug fix 说明: 若此 PR 标记为 Bug fix，我已提交或关联对应 Issue，且不会将设计取舍、预期不一致或理解偏差直接归类为 bug。
• 变更理解: 我已理解这些更改的工作原理及可能影响。
• 范围聚焦: 本 PR 未包含任何与当前任务无关的代码改动。
• 本地验证: 已在本地运行并通过测试或手动验证，维护者可以据此复核结果。
• 安全合规: 代码中无敏感凭据，且符合项目代码规范。

📸 运行证明 / Proof of Work

go test -count=1 ./relay/channel/moonshot

ok  	github.com/QuantumNous/new-api/relay/channel/moonshot	0.009s

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

## Release Notes

* **Bug Fixes**
* Corrected temperature parameter handling for the kimi-k2.6 model to ensure consistent and compatible behavior.

* **Tests**
* Added unit tests validating temperature parameter handling across Moonshot models.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

[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: 95112a89-6ea5-4d21-a1b4-767c6b7cc680

📥 Commits

Reviewing files that changed from the base of the PR and between d2576dd and 6f543aa.

📒 Files selected for processing (2)

• relay/channel/moonshot/adaptor.go
• relay/channel/moonshot/adaptor_test.go

---

Walkthrough

The Moonshot adapter adds temperature normalization logic to enforce the kimi-k2.6 model's requirement that temperature must be exactly 1.0, converting any provided temperature value or omitting it when absent, while preserving temperature for other Moonshot models.

Changes

Moonshot adapter temperature constraint handling

Layer / File(s)	Summary
Temperature constraint implementation relay/channel/moonshot/adaptor.go	Added strings and common package imports. Enhanced ConvertOpenAIRequest to detect the kimi-k2.6 upstream model and force its temperature to exactly 1.0 using helper functions for model name resolution and one-only constraint detection.
Temperature handling unit tests relay/channel/moonshot/adaptor_test.go	Added three unit tests validating that temperature is normalized to 1.0 for kimi-k2.6 when provided, preserved as omitted when not provided, and left unchanged for other models like kimi-k2.5.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit hops through adaptor code,
where Kimi's temperature must always load,
at one-point-zero, locked and tight—
no more bad requests in the night! 🌙✨

🚥 Pre-merge checks | ✅ 4 | ❌ 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 (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: fixing temperature normalization for the kimi k2.6 model in the Moonshot adapter.
Linked Issues check	✅ Passed	The PR successfully implements the core requirement from issue #5372: the Moonshot adapter now normalizes temperature to 1.0 for kimi-k2.6 while preserving omitted temperatures and not affecting other models.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to the Moonshot adapter's temperature handling for kimi-k2.6, with supporting test coverage; no unrelated modifications detected.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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