fix: 修复 Issue 模板选择器缺失

[liuCodeBoy]

问题

GitHub Markdown Issue 模板要求使用 about 字段作为选择器描述。现有两个模板使用了不受支持的 description，导致模板无法正常显示在新建 Issue 的选择器中。

修改

• 将 Bug 报告模板的 description 更正为 about
• 将功能建议模板的 description 更正为 about

验证

• 校验两个模板的 frontmatter 均包含 GitHub 支持的字段
• git diff --check 通过

Fixes #1306

Summary by CodeRabbit

• Documentation
  • Updated bug report and feature request templates to use the supported description field.
  • Existing template wording and content remain unchanged.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9fd0f4d2-1058-4aad-b9e2-a13d123337cb

📥 Commits

Reviewing files that changed from the base of the PR and between 34b3dc9 and 9cd8820.

📒 Files selected for processing (2)

• .github/ISSUE_TEMPLATE/bug_report.md
• .github/ISSUE_TEMPLATE/feature_request.md

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📝 Walkthrough

Walkthrough

The pull request changes the YAML front-matter key from description to about in the bug report and feature request Markdown issue templates, without changing their displayed text.

Changes

Issue template metadata

Layer / File(s)	Summary
Update issue template front matter .github/ISSUE_TEMPLATE/bug_report.md, .github/ISSUE_TEMPLATE/feature_request.md	Both templates replace the description metadata key with about while preserving the existing values.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了通过修复 Issue 模板选择器缺失来解决的问题。
Linked Issues check	✅ Passed	两个已链接模板文件都将 frontmatter 的 description 改为 about，符合问题要求。
Out of Scope Changes check	✅ Passed	变更仅限于两个 Issue 模板的字段修正，没有明显无关改动。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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