Fix lastBootUpTime datetime format for MySQL

PowerShell was sending datetime in US locale format (12/7/2025 10:05:28 PM)
but MySQL requires ISO format (YYYY-MM-DD HH:MM:SS).

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

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

scripts/Update-PC-CompleteAsset.ps1

@@ -1111,7 +1111,10 @@ function Send-CompleteDataToDashboard {
             totalPhysicalMemory = $SystemInfo.TotalPhysicalMemory
             domainRole = $SystemInfo.DomainRole
             currentTimeZone = $SystemInfo.CurrentTimeZone
-            lastBootUpTime = $SystemInfo.LastBootUpTime
+            # Format lastBootUpTime as MySQL datetime (YYYY-MM-DD HH:MM:SS)
+            lastBootUpTime = if ($SystemInfo.LastBootUpTime) {
+                $SystemInfo.LastBootUpTime.ToString("yyyy-MM-dd HH:mm:ss")
+            } else { $null }
         }
         
         # Add warranty data if available