优化：完善麒麟2K显示与逐主机视频范围协商

terminal/kiosk-shell/scripts/vdi-moonlight-rkmpp

@@ -17,4 +17,22 @@ export HEVC_DECODER_HINT=hevc_rkmpp
 # Only affects unpaced rendering in the patched client. Leave the last presented
 # frame and decoder references intact; replace only waiting decoded frames.
 export VDI_LATEST_FRAME="${VDI_LATEST_FRAME:-1}"
+# A host can negotiate limited range to avoid Sunshine's software full-range
+# conversion. The decoder still expands the negotiated range for display.
+# Keep this per host: hardware-encoded desktops need no override.
+if [ "${1:-}" = stream ] && [ -z "${COLOR_RANGE_OVERRIDE+x}" ]; then
+    case "${2:-}" in
+        ''|*[!a-zA-Z0-9._-]*) ;;
+        *)
+            range_file="${XDG_CONFIG_HOME:-$HOME/.config}/vdi-terminal/host-color-range/$2"
+            if [ -f "$range_file" ]; then
+                color_range=$(cat "$range_file")
+                case "$color_range" in
+                    0|1) export COLOR_RANGE_OVERRIDE="$color_range" ;;
+                    *) echo 'Invalid host color range (expected 0 or 1)' >&2; exit 78 ;;
+                esac
+            fi
+            ;;
+    esac
+fi
 exec "$client" "$@"