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/core/extension/sftpfile.dart

@@ -12,21 +12,9 @@ extension SftpFileX on SftpFileMode {
 
   UnixPerm toUnixPerm() {
     return UnixPerm(
-      user: UnixPermOp(
-        r: userRead,
-        w: userWrite,
-        x: userExecute,
-      ),
-      group: UnixPermOp(
-        r: groupRead,
-        w: groupWrite,
-        x: groupExecute,
-      ),
-      other: UnixPermOp(
-        r: otherRead,
-        w: otherWrite,
-        x: otherExecute,
-      ),
+      user: UnixPermOp(r: userRead, w: userWrite, x: userExecute),
+      group: UnixPermOp(r: groupRead, w: groupWrite, x: groupExecute),
+      other: UnixPermOp(r: otherRead, w: otherWrite, x: otherExecute),
     );
   }
 }

lib/core/extension/ssh_client.dart

@@ -4,6 +4,7 @@ import 'dart:typed_data';
 import 'package:dartssh2/dartssh2.dart';
 import 'package:fl_lib/fl_lib.dart';
 import 'package:flutter/widgets.dart';
+import 'package:server_box/data/model/server/system.dart';
 
 import 'package:server_box/data/res/misc.dart';
 
@@ -13,6 +14,52 @@ typedef OnStdin = void Function(SSHSession session);
 typedef PwdRequestFunc = Future<String?> Function(String? user);
 
 extension SSHClientX on SSHClient {
+  /// Create a persistent PowerShell session for Windows commands
+  Future<(SSHSession, String)> execPowerShell(
+    OnStdin onStdin, {
+    SSHPtyConfig? pty,
+    OnStdout? onStdout,
+    OnStdout? onStderr,
+    bool stdout = true,
+    bool stderr = true,
+    Map<String, String>? env,
+  }) async {
+    final session = await execute(
+      'powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass',
+      pty: pty,
+      environment: env,
+    );
+
+    final result = BytesBuilder(copy: false);
+    final stdoutDone = Completer<void>();
+    final stderrDone = Completer<void>();
+
+    session.stdout.listen(
+      (e) {
+        onStdout?.call(e.string, session);
+        if (stdout) result.add(e);
+      },
+      onDone: stdoutDone.complete,
+      onError: stderrDone.completeError,
+    );
+
+    session.stderr.listen(
+      (e) {
+        onStderr?.call(e.string, session);
+        if (stderr) result.add(e);
+      },
+      onDone: stderrDone.complete,
+      onError: stderrDone.completeError,
+    );
+
+    onStdin(session);
+
+    await stdoutDone.future;
+    await stderrDone.future;
+
+    return (session, result.takeBytes().string);
+  }
+
   Future<(SSHSession, String)> exec(
     OnStdin onStdin, {
     String? entry,
@@ -22,9 +69,14 @@ extension SSHClientX on SSHClient {
     bool stdout = true,
     bool stderr = true,
     Map<String, String>? env,
+    SystemType? systemType,
   }) async {
     final session = await execute(
-      entry ?? 'cat | sh',
+      entry ??
+          switch (systemType) {
+            SystemType.windows => 'powershell -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Bypass',
+            _ => 'cat | sh',
+          },
       pty: pty,
       environment: env,
     );
@@ -81,9 +133,7 @@ extension SSHClientX on SSHClient {
           isRequestingPwd = true;
           final user = Miscs.pwdRequestWithUserReg.firstMatch(data)?.group(1);
           if (context == null) return;
-          final pwd = context.mounted
-              ? await context.showPwdDialog(title: user, id: id)
-              : null;
+          final pwd = context.mounted ? await context.showPwdDialog(title: user, id: id) : null;
           if (pwd == null || pwd.isEmpty) {
             session.stdin.close();
           } else {

lib/core/utils/comparator.dart

@@ -6,10 +6,8 @@ class ChainComparator<T> {
   ChainComparator.empty() : this._create(null, (a, b) => 0);
   ChainComparator.create() : this._create(null, (a, b) => 0);
 
-  static ChainComparator<T> comparing<T, F extends Comparable<F>>(
-      F Function(T) extractor) {
-    return ChainComparator._create(
-        null, (a, b) => extractor(a).compareTo(extractor(b)));
+  static ChainComparator<T> comparing<T, F extends Comparable<F>>(F Function(T) extractor) {
+    return ChainComparator._create(null, (a, b) => extractor(a).compareTo(extractor(b)));
   }
 
   int compare(T a, T b) {
@@ -26,8 +24,9 @@ class ChainComparator<T> {
   }
 
   ChainComparator<T> thenCompareBy<F extends Comparable<F>>(
-      F Function(T) extractor,
-      {bool reversed = false}) {
+    F Function(T) extractor, {
+    bool reversed = false,
+  }) {
     return ChainComparator._create(
       this,
       reversed
@@ -36,18 +35,12 @@ class ChainComparator<T> {
     );
   }
 
-  ChainComparator<T> thenWithComparator(Comparator<T> comparator,
-      {bool reversed = false}) {
-    return ChainComparator._create(
-      this,
-      !reversed ? comparator : (a, b) => comparator(b, a),
-    );
+  ChainComparator<T> thenWithComparator(Comparator<T> comparator, {bool reversed = false}) {
+    return ChainComparator._create(this, !reversed ? comparator : (a, b) => comparator(b, a));
   }
 
-  ChainComparator<T> thenCompareByReversed<F extends Comparable<F>>(
-      F Function(T) extractor) {
-    return ChainComparator._create(
-        this, (a, b) => -extractor(a).compareTo(extractor(b)));
+  ChainComparator<T> thenCompareByReversed<F extends Comparable<F>>(F Function(T) extractor) {
+    return ChainComparator._create(this, (a, b) => -extractor(a).compareTo(extractor(b)));
   }
 
   ChainComparator<T> thenTrueFirst(bool Function(T) f) {
@@ -63,8 +56,7 @@ class ChainComparator<T> {
 }
 
 class Comparators {
-  static Comparator<String> compareStringCaseInsensitive(
-      {bool uppercaseFirst = false}) {
+  static Comparator<String> compareStringCaseInsensitive({bool uppercaseFirst = false}) {
     return (String a, String b) {
       final r = a.toLowerCase().compareTo(b.toLowerCase());
       if (r != 0) return r;

lib/core/utils/server.dart

@@ -24,19 +24,12 @@ String decyptPem(List<String> args) {
   return sshKey.first.toPem();
 }
 
-enum GenSSHClientStatus {
-  socket,
-  key,
-  pwd,
-}
+enum GenSSHClientStatus { socket, key, pwd }
 
 String getPrivateKey(String id) {
   final pki = Stores.key.fetchOne(id);
   if (pki == null) {
-    throw SSHErr(
-      type: SSHErrType.noPrivateKey,
-      message: 'key [$id] not found',
-    );
+    throw SSHErr(type: SSHErrType.noPrivateKey, message: 'key [$id] not found');
   }
   return pki.key;
 }
@@ -73,36 +66,21 @@ Future<SSHClient> genClient(
       if (spi.jumpId != null) return Stores.server.box.get(spi.jumpId);
     }();
     if (jumpSpi_ != null) {
-      final jumpClient = await genClient(
-        jumpSpi_,
-        privateKey: jumpPrivateKey,
-        timeout: timeout,
-      );
+      final jumpClient = await genClient(jumpSpi_, privateKey: jumpPrivateKey, timeout: timeout);
 
-      return await jumpClient.forwardLocal(
-        spi.ip,
-        spi.port,
-      );
+      return await jumpClient.forwardLocal(spi.ip, spi.port);
     }
 
     // Direct
     try {
-      return await SSHSocket.connect(
-        spi.ip,
-        spi.port,
-        timeout: timeout,
-      );
+      return await SSHSocket.connect(spi.ip, spi.port, timeout: timeout);
     } catch (e) {
       Loggers.app.warning('genClient', e);
       if (spi.alterUrl == null) rethrow;
       try {
         final res = spi.fromStringUrl();
         alterUser = res.$2;
-        return await SSHSocket.connect(
-          res.$1,
-          res.$3,
-          timeout: timeout,
-        );
+        return await SSHSocket.connect(res.$1, res.$3, timeout: timeout);
       } catch (e) {
         Loggers.app.warning('genClient alterUrl', e);
         rethrow;