fix: respect zero values for forward parser depth/fetch limits

[Foolllll-J]

_read_int_mapping in quoted_message/settings.py treated 0 as invalid and fell back to the default value (4/6/32), making it impossible for users to disable forward message parsing by setting all limits to 0 in WebUI.

Modifications / 改动点

• astrbot/core/utils/quoted_message/settings.py:24 — value <= 0 → value < 0, allowing 0 to pass through as a valid value.
• astrbot/core/utils/quoted_message/extractor.py:56 — skip WARN log when max_fetch=0 (user intentionally disabled fetching).
• 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

Respect zero values in quoted message forward parsing limits and avoid warning logs when users intentionally disable fetching.

Bug Fixes:

• Treat 0 as a valid configuration value for forward parser depth/fetch limits instead of falling back to defaults.
• Skip nested forward fetching warnings when max_fetch is explicitly set to 0 to disable fetching.

[gemini-code-assist]

Caution

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[sourcery-ai]

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

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