style: unify public header nav link font size to 14px (text-sm)

[feitianbubu]

⚠️ 提交说明 / PR Notice

模型广场和排行榜导航链接用的是 13px，控制台他导航是14px, 改成统一14px

🚀 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

• 无

✅ 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

纯 className 两行改动，本地起前端肉眼确认导航字号 13px → 14px，无布局问题。

Summary by CodeRabbit

• Style
  • Updated desktop navigation link text sizing for a more consistent appearance across internal and external links.

[coderabbitai]

Walkthrough

Desktop external and internal navigation links now use the standard text-sm font size instead of text-[13px].

Changes

Desktop navigation typography

Layer / File(s)	Summary
Standardize desktop link sizing web/src/components/layout/components/public-header.tsx	External and internal desktop navigation links now use text-sm.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: calcium-ion

Poem

A rabbit hops through links so neat,
With standard text beneath its feet.
External, internal, side by side,
text-sm is now their guide.
Hop, hop—desktop looks complete!

🚥 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 and concisely describes the change from 13px arbitrary sizing to the standard 14px text-sm size in public header navigation.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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