[WIP] Add GLFW as a Git submodule

[Copilot]

Plan to replace vcpkg with GLFW submodule

• Explore repository structure and understand current setup
• Verify GLFW is already configured as a submodule in .gitmodules
• Verify GLFW is properly integrated in CMakeLists.txt
• Initialize GLFW submodule for testing
• Build project to ensure GLFW submodule works correctly
• Verify no vcpkg references remain in the codebase
• Document the findings
• Run code review and security checks

Current Status: GLFW is already configured as a git submodule in the repository. The .gitmodules file contains the GLFW submodule configuration, and CMakeLists.txt already uses add_subdirectory(vendor/glfw) to include it. No vcpkg configuration files were found in the repository.

Original prompt

Instead of relying on vcpkg add glfw as a submodule

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