feat: Windows compatibility (#836)

* feat: win compatibility

* fix

* fix: uptime parse

* opt.: linux uptime accuracy

* fix: windows temperature fetching

* opt.

* opt.: powershell exec

* refactor: address PR review feedback and improve code quality

### Major Improvements:
- **Refactored Windows status parsing**: Broke down large `_getWindowsStatus` method into 13 smaller, focused helper methods for better maintainability and readability
- **Extracted system detection logic**: Created dedicated `SystemDetector` helper class to separate OS detection concerns from ServerProvider
- **Improved concurrency handling**: Implemented proper synchronization for server updates using Future-based locks to prevent race conditions

### Bug Fixes:
- **Fixed CPU percentage parsing**: Removed incorrect '*100' multiplication in BSD CPU parsing (values were already percentages)
- **Enhanced memory parsing**: Added validation and error handling to BSD memory fallback parsing with proper logging
- **Improved uptime parsing**: Added support for multiple Windows date formats and robust error handling with validation
- **Fixed division by zero**: Added safety checks in Swap.usedPercent getter

### Code Quality Enhancements:
- **Added comprehensive documentation**: Documented Windows CPU counter limitations and approach
- **Strengthened error handling**: Added detailed logging and validation throughout parsing methods
- **Improved robustness**: Enhanced BSD CPU parsing with percentage validation and warnings
- **Better separation of concerns**: Each parsing method now has single responsibility

### Files Changed:
- `lib/data/helper/system_detector.dart` (new): System detection helper
- `lib/data/model/server/cpu.dart`: Fixed percentage parsing and added validation
- `lib/data/model/server/memory.dart`: Enhanced fallback parsing and division-by-zero protection
- `lib/data/model/server/server_status_update_req.dart`: Refactored into 13 focused parsing methods
- `lib/data/provider/server.dart`: Improved synchronization and extracted system detection

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

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

* refactor: parse & shell fn struct

---------

Co-authored-by: Claude <noreply@anthropic.com>

lib/view/page/backup.dart

@@ -76,9 +76,9 @@ final class _BackupPageState extends State<BackupPage> with AutomaticKeepAliveCl
         initiallyExpanded: false,
         children: [
           ListTile(
-            title: Text(libL10n.backup), 
-            trailing: const Icon(Icons.save), 
-            onTap: () => BackupService.backup(context, FileBackupSource())
+            title: Text(libL10n.backup),
+            trailing: const Icon(Icons.save),
+            onTap: () => BackupService.backup(context, FileBackupSource()),
           ),
           ListTile(
             trailing: const Icon(Icons.restore),
@@ -264,7 +264,6 @@ final class _BackupPageState extends State<BackupPage> with AutomaticKeepAliveCl
     ).cardx;
   }
 
-
   Future<void> _onTapWebdavDl(BuildContext context) async {
     webdavLoading.value = true;
     try {
@@ -357,7 +356,6 @@ final class _BackupPageState extends State<BackupPage> with AutomaticKeepAliveCl
     }
   }
 
-
   void _onBulkImportServers(BuildContext context) async {
     final data = await context.showImportDialog(title: l10n.server, modelDef: Spix.example.toJson());
     if (data == null) return;
@@ -394,11 +392,6 @@ final class _BackupPageState extends State<BackupPage> with AutomaticKeepAliveCl
     }
   }
 
-
-
-
-
-
   @override
   bool get wantKeepAlive => true;
 }