fix(config)-add-missing-dict-type-to-DEFAULT_VALUE_MAP

[lingyun14beta]

修复加载插件 schema 时 dict 类型被报告为"不受支持的配置类型"的问题。

Modifications / 改动点

• astrbot/core/config/default.py: DEFAULT_VALUE_MAP 添加 "dict": {}

• 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

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 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。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 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”。

• 🤓 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 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Bug Fixes:

• Prevent dict-typed plugin configuration options from being reported as unsupported by adding a default mapping for the dict type.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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