Move NVIDIA env setup to Hyprland Lua

Evaluate NVIDIA session env vars from default/hypr/nvidia.lua during Hyprland startup instead of appending them to each user's envs.lua during setup. This removes the per-user NVIDIA setup script execution while preserving the GSP/non-GSP detection.

install/config/user.sh

@@ -7,4 +7,3 @@ run_logged $OMARCHY_INSTALL/config/hardware/bluetooth-user.sh
 run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-audio-mixer.sh
 run_logged $OMARCHY_INSTALL/config/hardware/asus/fix-mic.sh
 run_logged $OMARCHY_INSTALL/config/hardware/framework/fix-f13-amd-audio-input.sh
-run_logged $OMARCHY_INSTALL/config/hardware/nvidia-user.sh