fix: Replace PAUSE with message syntax (not supported in DOS 6.22)

Issue: DOS 6.22 PAUSE command does not accept message text as parameter.
The syntax "PAUSE message..." is a Windows NT/2000+ feature that causes
command-line parameters (%1, %2, etc.) to be consumed/lost in DOS 6.22.

Root cause: User ran "T:\DEPLOY.BAT TS-4R" but script reported
"Machine name not provided". The parameter %1 was being consumed by
the invalid PAUSE syntax at line 31 before reaching GET_MACHINE_NAME.

Changes:
- Fixed 46 PAUSE commands across 9 BAT files
- Converted "PAUSE message..." to "ECHO message..." + "PAUSE"
- Updated check-dos-compatibility.ps1 to detect PAUSE with message
- Created fix-pause-syntax.ps1 automated fix script

Example fix:
BEFORE (Windows NT+ syntax, causes parameter loss):
  PAUSE Press any key to continue...

AFTER (DOS 6.22 compatible):
  ECHO Press any key to continue...
  PAUSE

DOS 6.22 PAUSE command:
- Syntax: PAUSE (no parameters)
- Displays: "Press any key to continue..."
- Cannot customize message (built-in text only)

Files modified:
- DEPLOY.BAT: 10 PAUSE commands fixed
- UPDATE.BAT: 7 PAUSE commands fixed
- CTONW.BAT: 8 PAUSE commands fixed
- NWTOC.BAT: 6 PAUSE commands fixed
- REBOOT.BAT: 4 PAUSE commands fixed
- STAGE.BAT: 6 PAUSE commands fixed
- CHECKUPD.BAT: 2 PAUSE commands fixed
- DOSTEST.BAT: 2 PAUSE commands fixed
- AUTOEXEC.BAT: 1 PAUSE command fixed

Deployed to:
- D2TESTNAS: /data/test/*.BAT (9,908 bytes for DEPLOY.BAT)

Testing: Should now correctly receive command-line parameter:
  T:\DEPLOY.BAT TS-4R

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

DEPLOY.BAT

@@ -29,7 +29,8 @@ ECHO   - STAGE.BAT   (System file staging)
 ECHO   - REBOOT.BAT  (Apply updates on reboot)
 ECHO   - CHECKUPD.BAT (Check for updates)
 ECHO.
-PAUSE Press any key to continue...
+ECHO Press any key to continue...
+PAUSE
 ECHO.
 
 REM ==================================================================
@@ -65,7 +66,8 @@ ECHO   NET USE T: \\D2TESTNAS\test /YES
 ECHO.
 ECHO Then run DEPLOY.BAT again.
 ECHO.
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 REM ==================================================================
@@ -101,7 +103,8 @@ ECHO   - CHECKUPD.BAT
 ECHO.
 ECHO Contact system administrator.
 ECHO.
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 REM ==================================================================
@@ -137,7 +140,8 @@ ECHO.
 ECHO Machine name must match folder on T: drive.
 ECHO Example: If this is TS-4R, T:\TS-4R\ must exist
 ECHO.
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 :MACHINE_FOLDER_ERROR
@@ -149,7 +153,8 @@ ECHO - T: drive is writable
 ECHO - Network connection is stable
 ECHO - Permissions to create directories
 ECHO.
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 REM ==================================================================
@@ -221,7 +226,8 @@ GOTO UPDATE_AUTOEXEC
 ECHO.
 ECHO [ERROR] Could not create C:\BAT directory
 ECHO.
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 :COPY_ERROR
@@ -233,7 +239,8 @@ ECHO - T: drive is accessible
 ECHO - C: drive has free space
 ECHO - No file locks on C:\BAT\
 ECHO.
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 REM ==================================================================
@@ -277,7 +284,8 @@ ECHO   2. Find line: SET MACHINE=...
 ECHO   3. Change to: SET MACHINE=%MACHINE%
 ECHO   4. Save and reboot
 ECHO.
-PAUSE Press any key to continue...
+ECHO Press any key to continue...
+PAUSE
 GOTO DEPLOYMENT_COMPLETE
 
 :AUTOEXEC_ERROR
@@ -287,7 +295,8 @@ ECHO.
 ECHO You must manually add this line to C:\AUTOEXEC.BAT:
 ECHO   SET MACHINE=%MACHINE%
 ECHO.
-PAUSE Press any key to continue...
+ECHO Press any key to continue...
+PAUSE
 GOTO DEPLOYMENT_COMPLETE
 
 REM ==================================================================
@@ -339,7 +348,8 @@ ECHO Machine: %MACHINE% >> T:\%MACHINE%\DEPLOY.LOG
 ECHO Files installed to: C:\BAT\ >> T:\%MACHINE%\DEPLOY.LOG
 ECHO AUTOEXEC.BAT backup: C:\AUTOEXEC.SAV >> T:\%MACHINE%\DEPLOY.LOG
 
-PAUSE Press any key to exit...
+ECHO Press any key to exit...
+PAUSE
 GOTO END
 
 REM ==================================================================