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/iperf.dart

@@ -4,7 +4,6 @@ import 'package:server_box/core/extension/context/locale.dart';
 import 'package:server_box/core/route.dart';
 import 'package:server_box/view/page/ssh/page/page.dart';
 
-
 class IPerfPage extends StatefulWidget {
   final SpiRequiredArgs args;
 
@@ -13,10 +12,7 @@ class IPerfPage extends StatefulWidget {
   @override
   State<IPerfPage> createState() => _IPerfPageState();
 
-  static const route = AppRouteArg<void, SpiRequiredArgs>(
-    page: IPerfPage.new,
-    path: '/iperf',
-  );
+  static const route = AppRouteArg<void, SpiRequiredArgs>(page: IPerfPage.new, path: '/iperf');
 }
 
 class _IPerfPageState extends State<IPerfPage> {
@@ -33,9 +29,7 @@ class _IPerfPageState extends State<IPerfPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: CustomAppBar(
-        title: const Text('iperf'),
-      ),
+      appBar: CustomAppBar(title: const Text('iperf')),
       body: _buildBody(),
       floatingActionButton: _buildFAB(),
     );
@@ -63,12 +57,7 @@ class _IPerfPageState extends State<IPerfPage> {
     return ListView(
       padding: const EdgeInsets.symmetric(horizontal: 17),
       children: [
-        Input(
-          controller: _hostCtrl,
-          label: l10n.host,
-          icon: Icons.computer,
-          suggestion: false,
-        ),
+        Input(controller: _hostCtrl, label: l10n.host, icon: Icons.computer, suggestion: false),
         Input(
           controller: _portCtrl,
           label: l10n.port,