docs: document modular controller setup and add FAQ entry
docs(wiki): update documentation for v1.22.0 release (volumetric fog, Filament PBR, GT7 tonemapper)
docs(wiki): update documentation for v1.21.0 release
docs(wiki): sync architecture, changelog, and feature guides through v1.20.15
docs(wiki): integrate visual comparison gallery and MME setup illustration
docs(wiki): correct SSGI morph slider names to SSGI+ / SSGI-
docs(wiki): create comprehensive documentation architecture across all core systems