chore: modern C# — GeneratedRegex, sealed classes (#313 partial)

SysManager/SysManager/Services/AppBlockerService.cs

@@ -17,7 +17,7 @@ namespace SysManager.Services;
 /// effectively preventing it from running. Fully reversible by removing the key.
 /// Requires administrator privileges.
 /// </summary>
-public sealed class AppBlockerService
+public sealed partial class AppBlockerService
 {
     private const string IfeoPath = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options";
     private const string BlockerDebugger = @"C:\Windows\System32\SysManager_Blocked.exe";
@@ -33,7 +33,7 @@ public static bool BlockApp(string exeName)
             exeName += ".exe";
 
         // SEC-004: reject path separators and invalid chars to prevent registry path injection
-        if (!System.Text.RegularExpressions.Regex.IsMatch(exeName, @"^[A-Za-z0-9_\-. ]+\.exe$", System.Text.RegularExpressions.RegexOptions.IgnoreCase))
+        if (!ExeNamePattern().IsMatch(exeName))
         {
             Log.Warning("Rejected invalid exeName: {ExeName}", exeName);
             return false;
@@ -78,7 +78,7 @@ public static bool UnblockApp(string exeName)
             exeName += ".exe";
 
         // SEC-004: apply same validation as BlockApp to prevent registry path injection
-        if (!System.Text.RegularExpressions.Regex.IsMatch(exeName, @"^[A-Za-z0-9_\-. ]+\.exe$", System.Text.RegularExpressions.RegexOptions.IgnoreCase))
+        if (!ExeNamePattern().IsMatch(exeName))
         {
             Log.Warning("Rejected invalid exeName for unblock: {ExeName}", exeName);
             return false;
@@ -190,4 +190,7 @@ public static IReadOnlyList<BlockedApp> GetBlockedApps()
 
         return blocked;
     }
+
+    [System.Text.RegularExpressions.GeneratedRegex(@"^[A-Za-z0-9_\-. ]+\.exe$", System.Text.RegularExpressions.RegexOptions.IgnoreCase)]
+    private static partial System.Text.RegularExpressions.Regex ExeNamePattern();
 }

SysManager/SysManager/Services/NetworkRepairService.cs

@@ -10,7 +10,7 @@ namespace SysManager.Services;
 /// Runs common network repair commands: DNS flush, Winsock reset, TCP/IP reset.
 /// Each method captures stdout/stderr and returns a <see cref="NetworkRepairResult"/>.
 /// </summary>
-public class NetworkRepairService
+public sealed class NetworkRepairService
 {
     private readonly PowerShellRunner _ps;
 

SysManager/SysManager/Services/PerformanceService.cs

@@ -24,7 +24,7 @@ namespace SysManager.Services;
 /// • NVIDIA GPU subkey is auto-detected (not hardcoded to 0000).
 /// • Visual effects use SystemParametersInfo (instant), not registry-only.
 /// </summary>
-public class PerformanceService
+public sealed class PerformanceService
 {
     private readonly PowerShellRunner _ps;
 

SysManager/SysManager/Services/PowerShellRunner.cs

@@ -19,7 +19,7 @@ namespace SysManager.Services;
 /// same reason. Callers that use RunAsync or RunScriptViaPwshAsync must only pass
 /// hard-coded script strings; never pass user input directly as a script.</para>
 /// </summary>
-public class PowerShellRunner
+public sealed class PowerShellRunner
 {
     public event Action<PowerShellLine>? LineReceived;
     public event Action<int>? ProgressChanged; // 0-100

SysManager/SysManager/Services/ServiceManagerService.cs

@@ -11,7 +11,7 @@ namespace SysManager.Services;
 /// Enumerates Windows services, provides gaming recommendations, and
 /// allows starting/stopping/changing startup type. All mutations require admin.
 /// </summary>
-public class ServiceManagerService
+public sealed partial class ServiceManagerService
 {
     /// <summary>
     /// Gaming-oriented recommendations for common Windows services.
@@ -128,7 +128,7 @@ public static async Task SetStartupTypeAsync(string serviceName, string startTyp
         // hyphens, underscores, dots, and dollar signs only (covers all valid
         // Windows service names including instance names like MSSQL$INSTANCE).
         if (string.IsNullOrWhiteSpace(serviceName) ||
-            !System.Text.RegularExpressions.Regex.IsMatch(serviceName, @"^[\w \-.$]+$"))
+            !ServiceNamePattern().IsMatch(serviceName))
             throw new ArgumentException("Invalid service name.", nameof(serviceName));
 
         var allowedTypes = new[] { "auto", "delayed-auto", "demand", "disabled" };
@@ -162,4 +162,7 @@ private static string GetServiceDescription(ServiceController sc)
         catch (System.Security.SecurityException) { return ""; }
         catch (UnauthorizedAccessException) { return ""; }
     }
+
+    [System.Text.RegularExpressions.GeneratedRegex(@"^[\w \-.$]+$")]
+    private static partial System.Text.RegularExpressions.Regex ServiceNamePattern();
 }

SysManager/SysManager/Services/SystemInfoService.cs

@@ -10,7 +10,7 @@ namespace SysManager.Services;
 /// <summary>
 /// Collects system information via WMI / CIM (no PowerShell spawn needed).
 /// </summary>
-public class SystemInfoService
+public sealed class SystemInfoService
 {
     public Task<SystemSnapshot> CaptureAsync(CancellationToken ct = default)
         => Task.Run(() => Capture(), ct);