sync: Dataforth sync fixes, TestDataDB stability, and client scripts

Dataforth DOS:
- TestDataDB: singleton DB connection fix (crash prevention), WAL mode,
  WinSW service config, backup script, uncaught exception handlers
- Sync-FromNAS.ps1: Get-NASFileList temp file approach to avoid SSH
  stdout deadlock, *> $null output suppression, 8.3 filename filter
  for PUSH phase, backslash-escaped SCP paths, rename-to-.synced
- import.js: INSERT OR REPLACE for re-tested devices
- Full import run: 1,028,275 -> 1,632,793 records, indexes added
- Deploy script for sync fixes to AD2

Client scripts (temp/):
- BG Builders: Lesley account check, MFA phone update
- Lonestar Electrical: Kyla/Russ Google Workspace setup, 2FA bypass
- AD2 diagnostics and NAS connectivity tests

PENDING: Investigate why newest test_date is Jan 19 despite daily tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

temp/ad2-diag.ps1

@@ -0,0 +1,28 @@
+# Diagnostic script for TestDataDB on AD2
+Write-Output "=== Node Process ==="
+Get-CimInstance Win32_Process -Filter "Name='node.exe'" | Select-Object ProcessId, CommandLine | Format-List
+
+Write-Output "=== HTTP Test ==="
+try {
+    $r = Invoke-WebRequest -Uri "http://localhost:3000/" -UseBasicParsing -TimeoutSec 10
+    Write-Output "Root page status: $($r.StatusCode)"
+    Write-Output "Content length: $($r.Content.Length)"
+    Write-Output "First 200 chars: $($r.Content.Substring(0, [Math]::Min(200, $r.Content.Length)))"
+} catch {
+    Write-Output "Root page ERROR: $($_.Exception.Message)"
+}
+
+Write-Output "`n=== API Test ==="
+try {
+    $r = Invoke-WebRequest -Uri "http://localhost:3000/api/stats" -UseBasicParsing -TimeoutSec 10
+    Write-Output "API status: $($r.StatusCode)"
+    Write-Output "First 200 chars: $($r.Content.Substring(0, [Math]::Min(200, $r.Content.Length)))"
+} catch {
+    Write-Output "API ERROR: $($_.Exception.Message)"
+}
+
+Write-Output "`n=== Service Log Files ==="
+Get-ChildItem "C:\Shares\testdatadb\logs\" -ErrorAction SilentlyContinue | Format-Table Name, Length, LastWriteTime
+
+Write-Output "`n=== Recent Event Log ==="
+Get-EventLog -LogName Application -Newest 5 -Source "*node*" -ErrorAction SilentlyContinue | Format-List