fix: Remove XCOPY /Q switch from all batch files

Issue: DOS 6.22 does not support XCOPY /Q (quiet mode) switch,
causing "Invalid switch - /Q" error during DEPLOY.BAT execution.

Changes:
- Removed /Q switch from 40 XCOPY commands across 8 BAT files
- Updated check-dos-compatibility.ps1 to detect XCOPY /Q usage
- Created fix-xcopy-q-switch.ps1 automated fix script

Files modified:
- DEPLOY.BAT: 5 XCOPY commands fixed
- UPDATE.BAT: 2 XCOPY commands fixed
- CTONW.BAT: 11 XCOPY commands fixed
- NWTOC.BAT: 2 XCOPY commands fixed
- DEPLOY_VERIFY.BAT, DEPLOY_TEST.BAT, DEPLOY_FROM_NAS.BAT,
  DEPLOY_FROM_AD2.BAT: Test/verification copies updated

DOS 6.22 XCOPY valid switches: /Y /S /E /D /H /K /C
Invalid switches: /Q (quiet mode)

Deployed to:
- D2TESTNAS: /data/test/*.BAT (via scp -O)
- AD2: C:/scripts/sync-copies/bat-files/*.BAT

Testing: DOS machine error "Invalid switch - /Q" resolved

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

UPDATE.BAT

@@ -118,9 +118,9 @@ REM /D = Copy only files that are newer
 REM /H = Copy hidden and system files
 REM /K = Copy attributes
 REM /C = Continue on errors
-REM /Q = Quiet mode (don't show filenames)
+REM  = Quiet mode (don't show filenames)
 
-XCOPY C:\*.* T:\%MACHINE%\BACKUP /S /E /Y /D /H /K /C /Q
+XCOPY C:\*.* T:\%MACHINE%\BACKUP /S /E /Y /D /H /K /C 
 
 REM Check XCOPY error level
 REM 0 = Files copied OK