chore: bump version to 4.28.0-beta.1

[Soulter]

Summary

• bump the project and package versions to 4.28.0-beta.1
• add the bilingual 4.28.0-beta.1 changelog

Validation

• uv run ruff format .
• uv run ruff check .

Summary by Sourcery

Prepare the 4.28.0-beta.1 beta release by updating version metadata and adding its changelog.

Enhancements:

• Release AstrBot 4.28.0-beta.1 with updated project and package version metadata.
• Document the 4.28.0-beta.1 additions, optimizations, and fixes in bilingual release notes.

Documentation:

• Add bilingual release notes covering the 4.28.0-beta.1 release.

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="changelogs/v4.28.0-beta.1.md" line_range="57" />
<code_context>
+### 主要修复
+
+- 钉钉部分情况下扫码之后出现 CREATING 未知状态导致无法继续创建。 (#9808)
+- 修复飞书群里下当 at 机器人在前而命令在后会无法触发命令的问题。 (#9872)
+- 按统一消息来源（UMO）隔离限流。 (#9814)
+- 使 Anthropic API Base URL 逻辑与 OpenAI API 保持一致，需要输入 /v1。 (#9802)
</code_context>
<issue_to_address>
**nitpick:** The Chinese changelog contains the malformed phrase “下当 at 机器人在前”, so readers cannot clearly understand the condition under which Lark commands failed to trigger.

**Suggested fix:** Replace “下当” with “当”.

```suggestion
- 修复飞书群里当 at 机器人在前而命令在后会无法触发命令的问题。 (#9872)
```
</issue_to_address>

Sourcery assessment

Approved.

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