Fix Backend service PYTHONPATH for shared module imports

Fixed critical runtime error where backend service couldn't import
shared modules (ModuleNotFoundError: No module named 'database').

Changes:
- Updated Install-BackendFirstTime: Set PYTHONPATH to shared directory
  instead of parent directory
- Added Fix-BackendPythonPath.ps1: Quick fix script for existing
  installations

The backend imports 'from database.oracle_pool' which requires the
database module to be in PYTHONPATH. Previously PYTHONPATH pointed to
C:\inetpub\wwwroot\roa2web but the database module is located at
C:\inetpub\wwwroot\roa2web\shared\database. Now PYTHONPATH correctly
points to the shared directory.

For existing installations, run Fix-BackendPythonPath.ps1 as Administrator
to update the service configuration without reinstalling.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

deployment/windows/scripts/Fix-BackendPythonPath.ps1

@@ -0,0 +1,31 @@
+# Quick fix script to update Backend service PYTHONPATH
+# Run this as Administrator to fix the ModuleNotFoundError
+
+param(
+    [string]$InstallPath = "C:\inetpub\wwwroot\roa2web",
+    [string]$ServiceName = "ROA2WEB-Backend"
+)
+
+Write-Host "Fixing Backend service PYTHONPATH..." -ForegroundColor Cyan
+
+# Stop service
+Write-Host "Stopping service..." -ForegroundColor Yellow
+& nssm stop $ServiceName
+Start-Sleep -Seconds 3
+
+# Update PYTHONPATH to shared directory
+$sharedPath = Join-Path $InstallPath "shared"
+Write-Host "Setting PYTHONPATH to: $sharedPath" -ForegroundColor Yellow
+& nssm set $ServiceName AppEnvironmentExtra "PYTHONPATH=$sharedPath"
+
+# Start service
+Write-Host "Starting service..." -ForegroundColor Yellow
+& nssm start $ServiceName
+Start-Sleep -Seconds 3
+
+# Check status
+Write-Host "`nChecking service status..." -ForegroundColor Cyan
+& nssm status $ServiceName
+
+Write-Host "`nDone! Check logs at: $InstallPath\logs\backend-stderr.log" -ForegroundColor Green
+Write-Host "If errors persist, check the log file for details." -ForegroundColor Yellow

deployment/windows/scripts/ROA2WEB-Console.ps1

@@ -624,7 +624,10 @@ function Install-BackendFirstTime {
         & nssm set $Config.BackendServiceName Description $Config.BackendServiceDescription
         & nssm set $Config.BackendServiceName Start SERVICE_AUTO_START
         & nssm set $Config.BackendServiceName AppDirectory $Config.BackendPath
-        & nssm set $Config.BackendServiceName AppEnvironmentExtra "PYTHONPATH=$($Config.InstallPath)"
+
+        # Set PYTHONPATH to shared directory for module imports
+        $sharedPath = Join-Path $Config.InstallPath "shared"
+        & nssm set $Config.BackendServiceName AppEnvironmentExtra "PYTHONPATH=$sharedPath"
 
         # Set logging
         $stdoutLog = Join-Path $Config.LogsPath "backend-stdout.log"