Reset system detection cache after cleanup

After clearing toolkit data, the detection cache needs to be reset so
the launcher will re-detect system info on next menu display.

Changes:
- Unset SYS_DETECTION_COMPLETE flag
- Unset all SYS_* environment variables
- Show user that cache was cleared

Fixes issue where cleanup wouldn't trigger re-detection

modules/maintenance/cleanup-toolkit-data.sh

@@ -240,4 +240,13 @@ if [ "${missing:-0}" -gt 0 ]; then
 fi
 
 echo ""
+
+# Reset system detection cache so it re-detects on next menu display
+unset SYS_DETECTION_COMPLETE
+for var in $(compgen -e | grep "^SYS_"); do
+    unset "$var"
+done
+echo -e "${CYAN}[INFO]${NC} System detection cache cleared - will re-detect on next menu"
+echo ""
+
 press_enter