remove shader comments and extra spaces

[nihui]

No description provided.

[tencent-adm]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.29%. Comparing base (419db5e) to head (cbd314d).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #6493    +/-   ##
========================================
  Coverage   93.29%   93.29%            
========================================
  Files         845      845            
  Lines      265560   266326   +766     
========================================
+ Hits       247743   248476   +733     
- Misses      17817    17850    +33     

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[Copilot]

Pull request overview

This pull request adds shader preprocessing steps to the CMake build system that remove comments and collapse extra whitespace from GLSL shader files before they are compiled into binary headers. This optimization reduces the size of shader code embedded in the final binary.

Key Changes

• Added regex-based comment removal to strip single-line C++ style comments (//)
• Added space/tab consolidation to replace multiple consecutive spaces or tabs with a single space

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