fix: ocr position offset on HiDPI displays

[rb-union]

• Add devicePixelRatio support to fix text box positioning on HiDPI screens
• Remove Image.Tile fillMode for better DPI compatibility
• Scale image dimensions based on device pixel ratio

Log: Fix ocr position offset on HiDPI displays.
Bug: https://pms.uniontech.com/bug-view-275403.html

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在LiveBlock.qml文件中，注释应该更详细地解释为什么需要使用默认的fillMode。
• 在livetextanalyzer.cpp文件中，setImage函数中对于设备像素比的判断和图像缩放逻辑可能需要更详细的注释，以便理解其目的。
• 在livetextanalyzer.cpp文件中，analyze函数中的while循环可能会导致阻塞，应该考虑使用更高效的等待机制。
• 在livetextanalyzer.cpp文件中，requestImage函数中对于图像的缩放逻辑可能需要更详细的注释，以便理解其目的。
• 在livetextanalyzer.h文件中，pixelRatio成员变量的注释应该更详细地解释其用途。

是否建议立即修改:
是

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pengfeixx, rb-union

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[myk1343]

[是否满足兼容性要求] Y
[是否满足commit提交规范] Y
[是否满足编码规范] Y
[Review结论] Pass
[Fail原因] N/A