fix(model): fallback to ratio-formatted model name

[RedwindA]

PR 类型

• Bug 修复
• 新功能

PR 是否包含破坏性更新？

• 是
• 否

PR 描述

当 MEMORY_CACHE_ENABLED=false 时(不知道为什么有人会搞成false)，middleware/distributor.go 的分发流程在选择可用 channel 时会依赖 model.GetChannel 的数据库查询结果。此时如果请求的 model 名称需要通过 setting/ratio_setting/model_ratio.go 的 FormatMatchingModelName 做匹配/归一化，原始查询可能返回空结果，从而导致分发失败。

本 PR 在 model/ability.go 的 GetChannel 中增加兜底逻辑：当首次查询返回空（或失败）时，使用 FormatMatchingModelName(model) 的结果再查询一次；仅当兜底查询成功时才覆盖原结果/错误，避免掩盖真实错误。这样即使关闭内存缓存，也能正确匹配到按 ratio 设置归一化后的模型名并完成分发。

Summary by CodeRabbit

• Refactor
  • Improved internal ability query logic with enhanced fallback handling for model name normalization to increase robustness when resolving model-related operations.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

A helper function queryAbilities is introduced to encapsulate the channel-ability fetch logic. When GetChannel cannot find abilities for the requested model, it attempts a fallback: normalizing the model name via ratio_setting.FormatMatchingModelName and retrying the query. A dependency on ratio_setting is added to support model name normalization.

Changes

Cohort / File(s)	Summary
Core Ability Query Logic model/ability.go	Extracts channel-ability fetch into internal queryAbilities helper. Adds fallback in GetChannel: on empty/failed query, normalizes model name and retries; clears error if fallback succeeds.
Dependency Management go.mod	Adds or updates dependency for ratio_setting module to support model name normalization.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• fix: 修复通配符处理对判断可用渠道的破坏 #1523: Implements parallel model-name normalization fallback logic in getRandomSatisfiedChannel with updates to FormatMatchingModelName, addressing similar lookup patterns across the codebase.

Poem

🐰 A query that stumbled, now stands up so tall,
With fallback normalization to catch it before the fall,
The abilities hop through, normalized and bright,
A refactored helper keeps the logic just right! ✨

Pre-merge checks and finishing touches

❌ 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%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix(model): fallback to ratio-formatted model name' clearly and specifically describes the main change: adding a fallback mechanism that uses ratio-formatted model names in the GetChannel function.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

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