fix: 修复备份时缺失的人格文件夹映射

[xzj0898]

修复备份功能中 MAIN_DB_MODELS 遗漏 persona_folders 表映射的问题，该问题导致备份文件缺失文件夹表数据，进而引发 personas 表的 folder_id 无法匹配到对应的文件夹数据，破坏了数据关联完整性。
fix #5027

Modifications / 改动点

1. 在 constants.py 的 MAIN_DB_MODELS 字典中补充 persona_folders 表与 PersonaFolder 模型的映射关系，确保备份时能导出该表数据；
2. 导入缺失的 PersonaFolder 类。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

代码变更后，备份压缩包main_db.json新增了以下字段（示例），原本无persona_folders

"persona_folders": [
    {
      "id": 1,
      "name": "test",
      "description": null,
      "folder_id": "737cacc0-e053-4b2a-ae3d-a62dbeea403c",
      "created_at": "2026-02-11T13:34:34.338254",
      "updated_at": "2026-02-11T13:34:34.338262",
      "parent_id": null,
      "sort_order": 0
    }
  ],

前端也可正常显示文件夹及文件夹下人格 ---

Checklist / 检查清单

• 😊 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。/ If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
• 👀 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。/ My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
• 🤓 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到了 requirements.txt 和 pyproject.toml 文件相应位置。/ I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
• 😮 我的更改没有引入恶意代码。/ My changes do not introduce malicious code.

Summary by Sourcery

错误修复：

• 将 persona_folders 表加入 MAIN_DB_MODELS，以便备份文件包含与 personas 关联的文件夹数据。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Include the persona_folders table in MAIN_DB_MODELS so backup files contain folder data linked to personas.

[dosubot]

Related Documentation

Checked 1 published document(s) in 1 knowledge base(s). No updates required.

^{How did I do? Any feedback?}  

[sourcery-ai]

Hey - 我在这里给出了一些总体反馈：

• 鉴于这次遗漏很容易被忽视，建议考虑将 MAIN_DB_MODELS 集中化管理，或从单一可信来源（例如 SQLAlchemy 的元数据或共享注册表）中自动生成，从而降低未来新增表在备份中被遗漏的风险。

给 AI Agent 的提示

Please address the comments from this code review:

## Overall Comments
- Since this omission was easy to miss, consider centralizing or generating `MAIN_DB_MODELS` from a single source of truth (e.g., SQLAlchemy metadata or a shared registry) to reduce the chances of future tables being left out of backups.

---

Sourcery 对开源项目免费——如果你觉得我们的评审有帮助，欢迎帮忙分享 ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{帮我变得更有用！请在每条评论上点 👍 或 👎，我会根据你的反馈改进后续的评审。}

Original comment in English

Hey - I've left some high level feedback:

• Since this omission was easy to miss, consider centralizing or generating MAIN_DB_MODELS from a single source of truth (e.g., SQLAlchemy metadata or a shared registry) to reduce the chances of future tables being left out of backups.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this omission was easy to miss, consider centralizing or generating `MAIN_DB_MODELS` from a single source of truth (e.g., SQLAlchemy metadata or a shared registry) to reduce the chances of future tables being left out of backups.

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}