feat: add unset price models tab to model pricing settings

[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

v1 界面的模型定价一直没有旧版的「未设置价格模型」功能，新加的模型要切回旧界面才能快速定价

这个 PR 在 计费设置 → 模型定价 下加回了这个 tab

🚀 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 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

从未设置价格模型中设置价格

添加成功

[coderabbitai]

Walkthrough

Adds an unset-models tab to model pricing. It detects missing base prices, fetches enabled models for filtering, restricts unset-mode actions, commits drafts before batch copying, and adds translations for the new tab and empty state.

Changes

Unset model pricing

Layer / File(s)	Summary
Pricing detection and model filtering web/default/src/features/system-settings/models/model-pricing-snapshots.ts, web/default/src/features/system-settings/models/model-ratio-visual-editor.tsx	Adds isBasePricingUnset and uses it to identify and display models without base pricing.
Unset pricing tab wiring web/default/src/features/system-settings/models/ratio-settings-card.tsx, web/default/src/features/system-settings/models/model-ratio-form.tsx, web/default/src/features/system-settings/billing/section-registry.tsx, web/default/src/i18n/locales/*	Adds the unset-models tab, enabled-model lookup, unset form variant, conditional controls, and localized labels.
Unset editor actions and state handling web/default/src/features/system-settings/models/model-ratio-table-columns.tsx, web/default/src/features/system-settings/models/model-ratio-visual-editor.tsx	Disables deletion and add-model actions in unset mode, commits open drafts before batch copy, and updates table, empty-state, and memoization behavior.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant RatioSettingsCard
  participant ModelRatioForm
  participant getEnabledModels
  participant ModelRatioVisualEditor
  RatioSettingsCard->>ModelRatioForm: render unset-models variant
  ModelRatioForm->>getEnabledModels: fetch enabled model names
  getEnabledModels-->>ModelRatioForm: return candidate names
  ModelRatioForm->>ModelRatioVisualEditor: apply unset filter and candidates

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Possibly related PRs

• QuantumNous/new-api#5275: Intersects with the visual editor draft commit and save flow.
• QuantumNous/new-api#5628: Intersects with visual-editor row filtering and deletion behavior.

Suggested reviewers: seefs001, Calcium-Ion

Poem

I’m a rabbit with prices to set,
Finding blank models in the net.
New tabs bloom bright,
Drafts commit right,
And translated labels won’t forget!

🚥 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
Linked Issues check	✅ Passed	The changes restore the unset price models workflow in v1 model pricing, matching issue #5779's goal.
Out of Scope Changes check	✅ Passed	No clearly unrelated changes appear; the editor, tab, and locale updates all support the unset price models feature.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding an Unset Price Models tab to model pricing settings.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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