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>

test/btrfs_test.dart

@@ -9,25 +9,25 @@ void main() {
       final disks = Disk.parse(_btrfsRaidJsonOutput);
       expect(disks, isNotEmpty);
       expect(disks.length, 4); // Should have 2 parent disks + 2 BTRFS partitions
-      
+
       // We should get two distinct disks with the same UUID but different paths
       final nvme1Disk = disks.firstWhere((disk) => disk.path == '/dev/nvme1n1p1');
       final nvme2Disk = disks.firstWhere((disk) => disk.path == '/dev/nvme2n1p1');
-      
+
       // Both should exist
       expect(nvme1Disk, isNotNull);
       expect(nvme2Disk, isNotNull);
-      
+
       // They should have the same UUID (since they're part of the same BTRFS volume)
       expect(nvme1Disk.uuid, nvme2Disk.uuid);
-      
+
       // But they should be treated as distinct disks
       expect(identical(nvme1Disk, nvme2Disk), isFalse);
-      
+
       // Verify DiskUsage counts physical disks correctly
       final usage = DiskUsage.parse(disks);
       // With our unique path+kname identifier, both disks should be counted
-      expect(usage.size, nvme1Disk.size + nvme2Disk.size); 
+      expect(usage.size, nvme1Disk.size + nvme2Disk.size);
       expect(usage.used, nvme1Disk.used + nvme2Disk.used);
     });
   });