Performance: profile + render-scale option for native-res Adreno

[fadi-labib]

Summary

The port runs at ~30–60 FPS at native 2800×1752 on the Tab S7+ (Adreno 650). Profile it and add headroom so it's comfortable on this and weaker Adreno devices.

Directions

• Profile first: in-game FPS counter during an actual match; adb shell dumpsys gfxinfo com.generalsx.generalszh only measures Android UI compositing (the game renders through DXVK→Vulkan, bypassing HWUI), so use the engine's own counter.
• Render-scale option: render the 3D scene at a lower internal resolution and let the swapchain upscale (native panel is high-DPI; the engine already has resolution-aware UI scaling). Biggest lever.
• Cap the shell-map/menu FPS (it doesn't need 60).
• Check the two-device boot's cost (see Android/Turnip: two-device boot is load-bearing — single D3D device renders 3D scene black #8) — minor.

Impact

Comfort + battery + broader Adreno device support. Not a blocker (playable today). Needs in-match measurement (human). Branch: feature/android-phase3-renderer.