feat: 补丁包生成前增加加密文件扫描 (Encryption file scan before packaging) (#82)

* feat: add encryption file scanning before patch packaging

- Add EncryptionDetectionService with multi-layered detection:
  - Extension blacklist matching (40+ known encrypted extensions)
  - PE file deep analysis (section name fingerprinting for 50+ protectors
    like .NET Reactor, ConfuserEx, VMProtect, Themida, UPX, etc.)
  - PE CLR/COR20 header integrity check for .NET assemblies
  - ELF file section analysis (, )
  - JAR/Class CAFEBABE magic number validation
  - Python .pyc magic number range check
  - Full-file Shannon entropy analysis (threshold 7.8, auto-skip
    compressed/media formats like .zip, .png, .mp4)
- Risk level classification: High / Medium / Low
- Toggle switch in PatchView UI, enabled by default
- Dialog prompt with grouped results when suspicious files found
  (Skip / Include All / Cancel)
- Full i18n support (zh-CN / en-US)

Closes #TBD

* fix: address Copilot review suggestions

- Fix dialog hang when user closes window via X button
  (set TCS result before Close, register Closed event as fallback)
- Replace hardcoded 'cancelled by user' with localized string
- Add ConfigureAwait(false) in scan loop to avoid UI thread
  context switching on every file iteration

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: JusterZhu

src/Models/EncryptionScanResult.cs

@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+
+namespace GeneralUpdate.Tools.Models;
+
+public enum RiskLevel
+{
+    /// <summary>Statistically anomalous but no explicit signature — informational only.</summary>
+    Low,
+
+    /// <summary>High entropy or structural anomaly — worth reviewing.</summary>
+    Medium,
+
+    /// <summary>Known protector signature or encryption container — strongly suggest exclusion.</summary>
+    High
+}
+
+public enum DetectionMethod
+{
+    ExtensionBlacklist,
+    PeProtectorSection,
+    PeClrHeader,
+    PeSectionEntropy,
+    ElfSectionEntropy,
+    JarClassMagic,
+    FullFileEntropy
+}
+
+public class SuspiciousFile
+{
+    public string RelativePath { get; set; } = "";
+    public string FilePath { get; set; } = "";
+    public RiskLevel Level { get; set; }
+    public string Reason { get; set; } = "";
+    public double Entropy { get; set; }
+    public DetectionMethod Method { get; set; }
+    public string? DetectionDetail { get; set; }
+}
+
+public class EncryptionScanResult
+{
+    public List<SuspiciousFile> SuspiciousFiles { get; set; } = new();
+    public int TotalFilesScanned { get; set; }
+    public bool HasSuspiciousFiles => SuspiciousFiles.Count > 0;
+    public bool HasHighRisk => SuspiciousFiles.Exists(f => f.Level == RiskLevel.High);
+}

src/Models/PatchConfigModel.cs

@@ -10,4 +10,5 @@ public partial class PatchConfigModel : ObservableObject
     [ObservableProperty] private string _version = "1.0.0";
     [ObservableProperty] private string _format = ".zip";
     [ObservableProperty] private string _outputPath = "";
+    [ObservableProperty] private bool _enableEncryptionCheck = true;
 }