fix: list only channel models in unset price models tab

[feitianbubu]

⚠️ 提交说明 / PR Notice

Important

• 请提供人工撰写的简洁摘要，避免直接粘贴未经整理的 AI 输出。

📝 变更描述 / Description

未设置价格模型列表目前的行来源是 渠道启用模型 ∪ 各倍率表出现过的模型名。后者会把一批"只在缓存/音频等次级倍率表里有 key、没有基础价、且不在任何渠道里"的历史遗留条目也列出来

改动：只取渠道设置的启用模型,显示更干净

🚀 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

• feat: add unset price models tab to model pricing settings #6124 的后续收敛，问题背景见 v1 版本中模型定价中缺少未设置价格模型功能 #5779

✅ 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

优化前: 会显示在硬编码但未在渠道里配置的模型

优化后: 只显示真正的未设置价格模型

Summary by CodeRabbit

• Bug Fixes
  • Improved model ratio editor filtering by showing only candidate models when viewing unset ratios.
  • Preserved existing model lists for other filter modes.

[coderabbitai]

Walkthrough

The model ratio visual editor now limits model names to candidates when filterMode is unset; other filter modes retain the merged saved, draft, and candidate model names.

Changes

Model filtering

Layer / File(s)	Summary
Conditional model name selection web/default/src/features/system-settings/models/model-ratio-visual-editor.tsx	modelNames uses only candidate models for the unset filter mode and retains the existing merged set for other modes.

Estimated code review effort: 2 (Simple) | ~5 minutes

Poem

A rabbit checks the model rows,
“Unset” keeps candidates in rows.
Saved and drafts remain in flight,
Other filters work just right.
Hop, hop—clean names take their place!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: limiting the Unset Price Models tab to channel-enabled models.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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