Add bitmap layer studio usage examples

[222448082Ashen]

Description

This PR adds a new integrated Graphics usage example bundle for Bitmap Layer Studio across C++, C# (top-level + OOP), and Python, along with a PNG preview and a short title/description text file.

Motivation:

• Provide a substantial multi-layer compositing example instead of a single-function snippet.
• Demonstrate a consistent render pipeline and alpha-blend guide logic in all supported languages.
• Improve category naming consistency in guides group metadata.

Related issue:

• N/A (curriculum/task-driven addition).

Dependencies:

• No new package dependencies were added.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (update or new)

How Has This Been Tested?

Executed and verified:

1. Usage example generation/validation:
   • node usage-examples-testing-script.cjs bitmap_layer_studio-1-example
2. C++ compile in SplashKit MINGW64 environment:
   • ~/.splashkit/skm clang++ bitmap_layer_studio-1-example.cpp -o bitmap_layer_studio-1-example.exe
3. Runtime launch smoke test (timed):
   • timeout 8s ./bitmap_layer_studio-1-example.exe

Notes:

• Runtime warnings appear if expected layer image files are not present locally for execution.
• Full docs build currently fails in this branch due to a pre-existing/generated duplicate import issue in usage-examples Animations output, not caused by Bitmap Layer Studio files.

Testing Checklist

• Tested in latest Chrome
• Tested in latest Firefox
• npm run build
• npm run preview

Checklist

If involving code

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

If modified config files

• I have checked package.json for changes
• I have checked astro.config.mjs for changes
• I have checked netlify.toml for changes
• I have checked docker-compose.yml for changes
• I have checked custom.css for changes

Folders and Files Added/Modified

• Added:
  • bitmap_layer_studio-1-example.cpp
  • bitmap_layer_studio-1-example-top-level.cs
  • bitmap_layer_studio-1-example-oop.cs
  • bitmap_layer_studio-1-example.py
  • bitmap_layer_studio-1-example.png
  • bitmap_layer_studio-1-example.txt
• Modified:
  • guides-groups.json

Additional Notes

• The example logic and comments are aligned across C++, C#, and Python variants.
• The example demonstrates strict back-to-front compositing plus alpha-guide calculations for teaching depth/layer ordering.

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