fix: improve MIME type detection and add man page support

[liyigang1]

Change MIME type detection to use content-based matching for more accurate file type recognition
Add application/x-troff-man MIME type to supported file types list

This improves file type detection accuracy by examining file contents
rather than relying solely on file extensions.

Log: improve MIME type detection and add man page support
Bug: https://pms.uniontech.com//bug-view-314393.html

[sourcery-ai]

Hey @liyigang1 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding the MIME type to a dedicated configuration file instead of hardcoding it.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds support for man page files by including the application/x-troff-man MIME type to the list of supported file types. This enables the application to open and edit man page files.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added support for the application/x-troff-man MIME type.	Added application/x-troff-man to the list of supported MIME types.	src/common/utils.cpp

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[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 代码修改使用了QMimeDatabase::MatchMode::MatchContent来获取文件类型，这可能会提高准确性，但需要确保这一改动不会对性能产生负面影响。

是否建议立即修改:

• 否，这个改动看起来是有意为之，以提高文件类型的准确性。但是，需要进一步测试以确保性能不会受到影响，并且不会引入新的错误。如果测试结果表明性能没有问题，那么可以接受这个改动。

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: liyigang1, max-lvs

The full list of commands accepted by this bot can be found here.

Details

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• debian/deepin/OWNERS

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