chore: remove NoWarn and fix .NET 10 build warnings across platforms (#9301)

* deps: bump ZXing.Net.Bindings.SkiaSharp from 0.16.14 to 0.16.22

Patch update to the latest stable release on the 0.16.x line. No breaking changes, no public API changes - purely internal fixes.

Verified by a full Release build of v2rayN.sln on .NET 10; no new warnings or errors are introduced.

* chore: remove NoWarn and fix .NET 10 build warnings

Removes the repository-level NoWarn suppression from Directory.Build.props and addresses the warnings that surface on top of the .NET 10 migration in #9179, keeping Debug, Release, and cross-platform publishes warning-free without suppressing warnings globally.

Changes:

- Removes <NoWarn>CA1031;CS1591;NU1507;CA1416;IDE0058;IDE0053;IDE0200</NoWarn> from Directory.Build.props.

- Annotates Windows-only APIs with [SupportedOSPlatform] and [SupportedOSPlatformGuard] so CA1416 accepts that the Windows surface is gated behind Utils.IsWindows() / Utils.IsNonWindows().

- Splits Utils.SetUnixFileMode into a cross-platform wrapper and a private [UnsupportedOSPlatform("windows")] implementation so File.SetUnixFileMode never reaches the analyzer on Windows builds.

- Adds a parameterless constructor to MessageBoxDialog so Avalonia's runtime XAML loader (AVLN3001) can instantiate the dialog.

- Moves the WPF high-DPI configuration from app.manifest to <ApplicationHighDpiMode>PerMonitorV2</ApplicationHighDpiMode> in v2rayN.csproj, fixing WFO0003.

- Adds global using System.Runtime.Versioning; to ServiceLib and v2rayN.Desktop so the platform attributes are usable project-wide.

* test: make cycle dependency tests locale-independent

Accept the localized Russian cycle dependency diagnostic in CoreConfigContextBuilderTests so the assertions pass when tests run under a Russian UI culture.

* fix: tighten Unix platform handling

Adds Linux and macOS platform guards so the analyzer can narrow calls through Utils.IsLinux() and Utils.IsMacOS().

Marks the Linux/macOS autostart and system proxy helpers with explicit platform attributes.

Updates Utils.GetSystemHosts() to read /etc/hosts on Linux and macOS while keeping the existing Windows hosts and hosts.ics merge behavior.

v2rayN/ServiceLib/Common/Utils.cs

@@ -864,15 +864,25 @@ public class Utils
 
     public static Dictionary<string, string> GetSystemHosts()
     {
-        var hosts = GetSystemHosts(@"C:\Windows\System32\drivers\etc\hosts");
-        var hostsIcs = GetSystemHosts(@"C:\Windows\System32\drivers\etc\hosts.ics");
-
-        foreach (var (key, value) in hostsIcs)
+        if (IsWindows())
         {
-            hosts[key] = value;
+            var hosts = GetSystemHosts(@"C:\Windows\System32\drivers\etc\hosts");
+            var hostsIcs = GetSystemHosts(@"C:\Windows\System32\drivers\etc\hosts.ics");
+
+            foreach (var (key, value) in hostsIcs)
+            {
+                hosts[key] = value;
+            }
+
+            return hosts;
         }
 
-        return hosts;
+        if (IsLinux() || IsMacOS())
+        {
+            return GetSystemHosts("/etc/hosts");
+        }
+
+        return new Dictionary<string, string>();
     }
 
     public static async Task<string?> GetCliWrapOutput(string filePath, string? arg)
@@ -1114,12 +1124,16 @@ public class Utils
 
     #region Platform
 
+    [SupportedOSPlatformGuard("windows")]
     public static bool IsWindows() => OperatingSystem.IsWindows();
 
+    [SupportedOSPlatformGuard("linux")]
     public static bool IsLinux() => OperatingSystem.IsLinux();
 
+    [SupportedOSPlatformGuard("macos")]
     public static bool IsMacOS() => OperatingSystem.IsMacOS();
 
+    [UnsupportedOSPlatformGuard("windows")]
     public static bool IsNonWindows() => !OperatingSystem.IsWindows();
 
     public static string GetExeName(string name)
@@ -1214,6 +1228,16 @@ public class Utils
     }
 
     public static bool SetUnixFileMode(string? fileName)
+    {
+        if (IsWindows())
+        {
+            return false;
+        }
+        return SetUnixFileModeInternal(fileName);
+    }
+
+    [UnsupportedOSPlatform("windows")]
+    private static bool SetUnixFileModeInternal(string? fileName)
     {
         try
         {

v2rayN/ServiceLib/Common/WindowsUtils.cs

@@ -2,6 +2,7 @@ using Microsoft.Win32;
 
 namespace ServiceLib.Common;
 
+[SupportedOSPlatform("windows")]
 internal static class WindowsUtils
 {
     private static readonly string _tag = "WindowsUtils";

v2rayN/ServiceLib/GlobalUsings.cs

@@ -8,6 +8,7 @@ global using System.Reactive.Disposables;
 global using System.Reactive.Linq;
 global using System.Reflection;
 global using System.Runtime.InteropServices;
+global using System.Runtime.Versioning;
 global using System.Security.Cryptography;
 global using System.Text;
 global using System.Text.Encodings.Web;

v2rayN/ServiceLib/Handler/AutoStartupHandler.cs

@@ -41,6 +41,7 @@ public static class AutoStartupHandler
 
     #region Windows
 
+    [SupportedOSPlatform("windows")]
     private static async Task ClearTaskWindows()
     {
         var autoRunName = GetAutoRunNameWindows();
@@ -53,6 +54,7 @@ public static class AutoStartupHandler
         await Task.CompletedTask;
     }
 
+    [SupportedOSPlatform("windows")]
     private static async Task SetTaskWindows()
     {
         try
@@ -82,6 +84,7 @@ public static class AutoStartupHandler
     /// <param name="fileName"></param>
     /// <param name="description"></param>
     /// <exception cref="ArgumentNullException"></exception>
+    [SupportedOSPlatform("windows")]
     public static void AutoStartTaskService(string taskName, string fileName, string description)
     {
         if (taskName.IsNullOrEmpty())
@@ -124,6 +127,7 @@ public static class AutoStartupHandler
 
     #region Linux
 
+    [SupportedOSPlatform("linux")]
     private static async Task ClearTaskLinux()
     {
         try
@@ -137,6 +141,7 @@ public static class AutoStartupHandler
         await Task.CompletedTask;
     }
 
+    [SupportedOSPlatform("linux")]
     private static async Task SetTaskLinux()
     {
         try
@@ -157,6 +162,7 @@ public static class AutoStartupHandler
         }
     }
 
+    [SupportedOSPlatform("linux")]
     private static string GetHomePathLinux()
     {
         var homePath = Path.Combine(Utils.GetHomePath(), ".config", "autostart", $"{Global.AppName}.desktop");
@@ -168,6 +174,7 @@ public static class AutoStartupHandler
 
     #region macOS
 
+    [SupportedOSPlatform("macos")]
     private static async Task ClearTaskOSX()
     {
         try
@@ -187,6 +194,7 @@ public static class AutoStartupHandler
         }
     }
 
+    [SupportedOSPlatform("macos")]
     private static async Task SetTaskOSX()
     {
         try
@@ -204,6 +212,7 @@ public static class AutoStartupHandler
         }
     }
 
+    [SupportedOSPlatform("macos")]
     private static string GetLaunchAgentPathMacOS()
     {
         var homePath = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
@@ -212,6 +221,7 @@ public static class AutoStartupHandler
         return launchAgentPath;
     }
 
+    [SupportedOSPlatform("macos")]
     private static string GenerateLaunchAgentPlist()
     {
         var exePath = Utils.GetExePath();

v2rayN/ServiceLib/Handler/SysProxy/ProxySettingLinux.cs

@@ -1,5 +1,6 @@
 namespace ServiceLib.Handler.SysProxy;
 
+[SupportedOSPlatform("linux")]
 public static class ProxySettingLinux
 {
     private static readonly string _proxySetFileName = $"{Global.ProxySetLinuxShellFileName.Replace(Global.NamespaceSample, "")}.sh";

v2rayN/ServiceLib/Handler/SysProxy/ProxySettingOSX.cs

@@ -1,5 +1,6 @@
 namespace ServiceLib.Handler.SysProxy;
 
+[SupportedOSPlatform("macos")]
 public static class ProxySettingOSX
 {
     private static readonly string _proxySetFileName = $"{Global.ProxySetOSXShellFileName.Replace(Global.NamespaceSample, "")}.sh";

v2rayN/ServiceLib/Handler/SysProxy/ProxySettingWindows.cs

@@ -2,6 +2,7 @@ using static ServiceLib.Handler.SysProxy.ProxySettingWindows.InternetConnectionO
 
 namespace ServiceLib.Handler.SysProxy;
 
+[SupportedOSPlatform("windows")]
 public static class ProxySettingWindows
 {
     private const string _regPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings";

v2rayN/ServiceLib/Handler/SysProxy/SysProxyHandler.cs

@@ -88,6 +88,7 @@ public static class SysProxyHandler
         }
     }
 
+    [SupportedOSPlatform("windows")]
     private static async Task SetWindowsProxyPac(int port)
     {
         var portPac = AppManager.Instance.GetLocalPort(EInboundProtocol.pac);

v2rayN/ServiceLib/Manager/CoreManager.cs

@@ -8,6 +8,7 @@ public class CoreManager
     private static readonly Lazy<CoreManager> _instance = new(() => new());
     public static CoreManager Instance => _instance.Value;
     private Config _config;
+    [SupportedOSPlatform("windows")]
     private WindowsJobService? _processJob;
     private ProcessService? _processService;
     private ProcessService? _processPreService;

v2rayN/ServiceLib/Services/WindowsJobService.cs

@@ -3,6 +3,7 @@ namespace ServiceLib.Services;
 /// <summary>
 /// http://stackoverflow.com/questions/6266820/working-example-of-createjobobject-setinformationjobobject-pinvoke-in-net
 /// </summary>
+[SupportedOSPlatform("windows")]
 public sealed class WindowsJobService : IDisposable
 {
     private nint handle = nint.Zero;