Add OpenGL backend infrastructure for cross-platform EGE support#360

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Copilot wants to merge 3 commits intomasterfrom

copilot/refactor-ege-for-cross-platform-again

Commits on Jan 1, 2026

Initial plan
Copilot
committed
Add INIT_OPENGL flag and backend abstraction layer infrastructure

Copilot
and
wysaid
committed
Address code review feedback: use std::vector, improve error logging, add proper documentation

Copilot
and
wysaid
committed