fix: Unable to obtain system startup time

Author: lxdklp

lib/data/helper/ssh_decoder.dart

@@ -9,7 +9,10 @@ class SSHDecoder {
   ///
   /// Tries in order:
   /// 1. UTF-8 (with allowMalformed for lenient parsing)
+  ///    - Windows PowerShell scripts now set UTF-8 output encoding by default
   /// 2. GBK (for Windows Chinese systems)
+  ///    - In some cases, Windows will still revert to GBK.
+  ///    - Only attempted if UTF-8 produces replacement characters (�)
   static String decode(
     List<int> bytes, {
     bool isWindows = false,
@@ -21,9 +24,15 @@ class SSHDecoder {
     try {
       final result = utf8.decode(bytes, allowMalformed: true);
       // Check if there are replacement characters indicating decode failure
+      // For non-Windows systems, always use UTF-8 result
       if (!result.contains('�') || !isWindows) {
         return result;
       }
+      // For Windows with replacement chars, log and try GBK fallback
+      if (isWindows && result.contains('�')) {
+        final contextInfo = context != null ? ' [$context]' : '';
+        Loggers.app.info('UTF-8 decode has replacement chars$contextInfo, trying GBK fallback');
+      }
     } catch (e) {
       final contextInfo = context != null ? ' [$context]' : '';
       Loggers.app.warning('UTF-8 decode failed$contextInfo: $e');

lib/data/model/app/scripts/cmd_types.dart

@@ -183,7 +183,19 @@ enum WindowsStatusCmdType implements ShellCmdType {
     'Get-WmiObject -Class Win32_Processor | '
     'Select-Object Name, LoadPercentage, NumberOfCores, NumberOfLogicalProcessors | ConvertTo-Json',
   ),
-  uptime('(Get-CimInstance -ClassName Win32_OperatingSystem).LastBootUpTime'),
+
+  /// Get system uptime by calculating time since last boot
+  ///
+  /// Calculates uptime directly in PowerShell to avoid date format parsing issues:
+  /// - Gets LastBootUpTime from Win32_OperatingSystem
+  /// - Calculates difference from current time
+  /// - Returns pre-formatted string: "X days, H:MM" or "H:MM" (if less than 1 day)
+  /// - Uses ToString('00') for zero-padding to avoid quote escaping issues
+  uptime(
+    r'$up = (Get-Date) - (Get-CimInstance Win32_OperatingSystem).LastBootUpTime; '
+    r'if ($up.Days -gt 0) { "$($up.Days) days, $($up.Hours):$($up.Minutes.ToString(''00''))" } '
+    r'else { "$($up.Hours):$($up.Minutes.ToString(''00''))" }',
+  ),
   conn('(netstat -an | findstr ESTABLISHED | Measure-Object -Line).Count'),
   disk(
     'Get-WmiObject -Class Win32_LogicalDisk | '

lib/data/model/app/scripts/script_consts.dart

@@ -105,6 +105,7 @@ exec 2>/dev/null
 # DO NOT delete this file while app is running
 
 \$ErrorActionPreference = "SilentlyContinue"
+[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
 
 ''';
 }

lib/data/model/server/server_status_update_req.dart

@@ -436,8 +436,11 @@ void _parseWindowsDiskData(ServerStatusUpdateReq req, Map<String, String> parsed
 /// Parse Windows uptime data
 void _parseWindowsUptimeData(ServerStatusUpdateReq req, Map<String, String> parsedOutput) {
   try {
-    final uptime = WindowsParser.parseUpTime(WindowsStatusCmdType.uptime.findInMap(parsedOutput));
-    if (uptime != null) {
+    final uptimeRaw = WindowsStatusCmdType.uptime.findInMap(parsedOutput);
+    if (uptimeRaw.isNotEmpty && uptimeRaw != 'null') {
+      // PowerShell now returns pre-formatted uptime string (e.g., "28 days, 5:00" or "5:00")
+      // No parsing needed - use it directly
+      final uptime = uptimeRaw.trim();
       req.ss.more[StatusCmdType.uptime] = uptime;
     }
   } catch (e, s) {