Enhance CMakeLists.txt with detailed English comments for better readability

[scottXchoo]

This pull request aims to improve the readability and accessibility of the CMakeLists.txt file by adding detailed English comments. The changes include:

1. Added comprehensive English comments explaining each section and important configuration options.
2. Replaced existing brief or non-English comments with more descriptive English explanations.
3. Improved overall structure and formatting for better readability.

As a developer who wishes for this open-source project to be used and appreciated by people from around the world, I have made these small but significant changes to ensure that developers from different countries can better understand the build configuration and options available in the RibbonUI project. This will also facilitate easier maintenance and future contributions to the project.

Key improvements:

• Explained Qt package finding and version handling
• Clarified the purpose of each build option
• Detailed the conditional logic for macOS universal build
• Described the QWindowKit configuration options

No functional changes have been made to the CMake configuration itself; this PR focuses solely on improving documentation and clarity.

I believe these changes will make the project more accessible to a wider audience and encourage more contributions from the global developer community.

[mentalfl0w]

Thank you very much😁!
This PR could be very useful for all developers from all over the world👍.

[scottXchoo]

Thank you very much😁! This PR could be very useful for all developers from all over the world👍.

You're welcome🤗
I hope this open source will spread to many developers, thank you so much for making this open sources~!