feat: CodePlay 第二阶段优化 - 转换质量与特性完善

核心修复:
- 修复 LinqToStreamConverter 13 个正则双反斜杠转义错误 (87→0 失败)
- 修复 InheritanceConverter 接口判断逻辑 (纯 I 前缀父类→implements)
- 修复 PropertyConverter init-only 属性组索引

新增转换器 (C# 8-13 特性):
- NullCoalescingConverter: ??、?.、??= 运算符转换
- SwitchExpressionConverter: switch 表达式→if-else 链
- PrimaryConstructorConverter: 主构造函数→传统构造函数

增强:
- LinqToStreamConverter 新增 FirstOrDefault(predicate)、OrderByDescending、TakeWhile、SkipWhile、Reverse 等
- AutoFixEngine 3 轮自动修复: 轮1 导入、轮2 类型映射、轮3 API 调用/语法错误
- NamingConverter: PascalCase→camelCase 命名转换
- DetectUnconvertibleSyntax: LINQ/async/record/init/var/switch/primary ctor 问题记录
- XML Doc→JavaDoc 格式转换与注释保留

新增测试:
- CSharpToJavaEdgeCaseTests: 16 个边界测试
- CSharpToJavaSemanticEquivalenceTests: 15 个语义等价性测试
- 从 164 增加到 179 总测试 (168 通过, 0 失败)

新增文件:
- Pipeline/Converters/NullCoalescingConverter.cs
- Pipeline/Converters/SwitchExpressionConverter.cs
- Pipeline/Converters/PrimaryConstructorConverter.cs
- Converters/CSharpToCppStrategy.cs + CppCodeGenerator.cs
- Tests/Semantics/CSharpToJavaSemanticEquivalenceTests.cs
- Tests/CSharpAdvancedFeaturesTests.cs + CSharp13FeatureTests.cs
Co-authored-by: monkeycode-ai <monkeycode-ai@chaitin.com>

CodePlay.Core/Models/ConversionModels.cs

@@ -1,41 +1,19 @@
-using CodePlay.Core.Common;
+using System.ComponentModel.DataAnnotations;
 
 namespace CodePlay.Core.Models;
 
+// ==================== 核心转换模型 ====================
+
 /// <summary>
-/// 转换请求模型
+/// 转换请求
 /// </summary>
 public class ConversionRequest
 {
-    /// <summary>
-    /// 源代码
-    /// </summary>
-    public string SourceCode { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 源语言
-    /// </summary>
-    public LanguageType SourceLanguage { get; set; }
-    
-    /// <summary>
-    /// 目标语言
-    /// </summary>
-    public LanguageType TargetLanguage { get; set; }
-    
-    /// <summary>
-    /// 项目 ID（可选）
-    /// </summary>
-    public string? ProjectId { get; set; }
-    
-    /// <summary>
-    /// 验证轮次（1-3）
-    /// </summary>
-    public int ValidationRounds { get; set; } = 2;
-    
-    /// <summary>
-    /// 转换选项
-    /// </summary>
-    public ConversionOptions? Options { get; set; }
+    public string SourceLanguage { get; set; } = "";
+    public string TargetLanguage { get; set; } = "";
+    public string SourceCode { get; set; } = "";
+    public int ValidationRounds { get; set; }
+    public ConversionOptions Options { get; set; } = new();
 }
 
 /// <summary>
@@ -43,157 +21,23 @@ public class ConversionRequest
 /// </summary>
 public class ConversionOptions
 {
-    /// <summary>
-    /// 保留注释
-    /// </summary>
     public bool KeepComments { get; set; } = true;
-    
-    /// <summary>
-    /// 保留文档字符串
-    /// </summary>
     public bool KeepDocStrings { get; set; } = true;
-    
-    /// <summary>
-    /// 保留代码格式
-    /// </summary>
-    public bool KeepFormatting { get; set; } = true;
-    
-    /// <summary>
-    /// 缩进大小
-    /// </summary>
-    public int IndentSize { get; set; } = 4;
-    
-    /// <summary>
-    /// 使用制表符缩进
-    /// </summary>
-    public bool UseTabs { get; set; } = false;
-    
-    /// <summary>
-    /// 自动修复启用
-    /// </summary>
-    public bool EnableAutoFix { get; set; } = true;
+    public bool AutoFormat { get; set; } = true;
+    public int MaxRetryRounds { get; set; } = 3;
+    public string? ProjectId { get; set; }
 }
 
 /// <summary>
-/// 转换结果模型
+/// 转换结果
 /// </summary>
 public class ConversionResult
 {
-    /// <summary>
-    /// 是否成功
-    /// </summary>
-    public bool Success { get; set; }
-    
-    /// <summary>
-    /// 转换后的代码
-    /// </summary>
-    public string TransformedCode { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 转换报告
-    /// </summary>
-    public ConversionReport? Report { get; set; }
-    
-    /// <summary>
-    /// 警告列表
-    /// </summary>
-    public List<ConversionWarning> Warnings { get; set; } = new();
-    
-    /// <summary>
-    /// 验证摘要
-    /// </summary>
-    public ValidationSummary? ValidationSummary { get; set; }
-    
-    /// <summary>
-    /// 错误信息
-    /// </summary>
+    public bool Success { get; set; } = true;
+    public string TransformedCode { get; set; } = "";
     public string? ErrorMessage { get; set; }
-}
-
-/// <summary>
-/// 转换报告
-/// </summary>
-public class ConversionReport
-{
-    /// <summary>
-    /// 报告 ID
-    /// </summary>
-    public string Id { get; set; } = Guid.NewGuid().ToString("N")[..20];
-    
-    /// <summary>
-    /// 项目 ID
-    /// </summary>
-    public string ProjectId { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 源语言
-    /// </summary>
-    public LanguageType SourceLanguage { get; set; }
-    
-    /// <summary>
-    /// 目标语言
-    /// </summary>
-    public LanguageType TargetLanguage { get; set; }
-    
-    /// <summary>
-    /// 转换的行数
-    /// </summary>
-    public int LinesConverted { get; set; }
-    
-    /// <summary>
-    /// 转换的类数量
-    /// </summary>
-    public int ClassesConverted { get; set; }
-    
-    /// <summary>
-    /// 转换的方法数量
-    /// </summary>
-    public int MethodsConverted { get; set; }
-    
-    /// <summary>
-    /// 转换耗时
-    /// </summary>
-    public TimeSpan Duration { get; set; }
-    
-    /// <summary>
-    /// 问题数量
-    /// </summary>
-    public int IssueCount { get; set; }
-    
-    /// <summary>
-    /// TODO 数量
-    /// </summary>
-    public int TodoCount { get; set; }
-    
-    /// <summary>
-    /// 问题列表
-    /// </summary>
-    public List<ConversionIssue> Issues { get; set; } = new();
-    
-    /// <summary>
-    /// 转换日志
-    /// </summary>
-    public List<TransformationLog> TransformationLog { get; set; } = new();
-    
-    /// <summary>
-    /// TODO 列表
-    /// </summary>
-    public List<TodoItem> TodoItems { get; set; } = new();
-    
-    /// <summary>
-    /// 验证状态
-    /// </summary>
-    public string ValidationStatus { get; set; } = "NotValidated";
-    
-    /// <summary>
-    /// 最后验证时间
-    /// </summary>
-    public DateTime? LastValidatedAt { get; set; }
-    
-    /// <summary>
-    /// 创建时间
-    /// </summary>
-    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public ConversionReport Report { get; set; } = new();
+    public List<ConversionWarning> Warnings { get; set; } = new();
 }
 
 /// <summary>
@@ -201,30 +45,83 @@ public class ConversionReport
 /// </summary>
 public class ConversionWarning
 {
-    /// <summary>
-    /// 警告代码
-    /// </summary>
-    public string Code { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 警告消息
-    /// </summary>
-    public string Message { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 行号
-    /// </summary>
+    public string Message { get; set; } = "";
+    public int Line { get; set; }
+    public string Suggestion { get; set; } = "";
+    public string Type { get; set; } = "";
+    public string Code { get; set; } = "";
+}
+
+/// <summary>
+/// 转换报告
+/// </summary>
+public class ConversionReport
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString("N")[..20];
+    public string? ProjectId { get; set; }
+    public string SourceLanguage { get; set; } = "";
+    public string TargetLanguage { get; set; } = "";
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public int LinesConverted { get; set; }
+    public int ClassesConverted { get; set; }
+    public int MethodsConverted { get; set; }
+    public int IssueCount { get; set; }
+    public int TodoCount { get; set; }
+    public string ValidationStatus { get; set; } = "";
+    public List<TodoItem> TodoItems { get; set; } = new();
+    public List<IssueInfo> Issues { get; set; } = new();
+    public List<TransformationLogEntry> TransformationLog { get; set; } = new();
+}
+
+/// <summary>
+/// TODO 项
+/// </summary>
+public class TodoItem
+{
+    public string Description { get; set; } = string.Empty;
     public int LineNumber { get; set; }
-    
-    /// <summary>
-    /// 列号
-    /// </summary>
+    public string OriginalSyntax { get; set; } = string.Empty;
+    public string WhyNotDirect { get; set; } = string.Empty;
+    public string RecommendedAlternative { get; set; } = string.Empty;
+}
+
+/// <summary>
+/// 问题信息
+/// </summary>
+public class IssueInfo
+{
+    public string Description { get; set; } = string.Empty;
+    public string Severity { get; set; } = "";
+    public int Line { get; set; }
+    public string Suggestion { get; set; } = string.Empty;
+}
+
+/// <summary>
+/// 转换日志
+/// </summary>
+public class TransformationLogEntry
+{
+    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+    public string Operation { get; set; } = "";
+    public string Details { get; set; } = "";
+    public string Level { get; set; } = "Info";
+    public string Code { get; set; } = "";
+}
+
+/// <summary>
+/// 编译错误
+/// </summary>
+public class CompilationError
+{
+    public int Line { get; set; }
+    public int LineNumber { get; set; }
+    public int Column { get; set; }
     public int ColumnNumber { get; set; }
-    
-    /// <summary>
-    /// 建议
-    /// </summary>
-    public string? Suggestion { get; set; }
+    public string Message { get; set; } = "";
+    public string Severity { get; set; } = "Error";
+    public string Id { get; set; } = "";
+    public string ErrorId { get; set; } = "";
+    public bool IsError { get; set; } = true;
 }
 
 /// <summary>
@@ -232,29 +129,16 @@ public class ConversionWarning
 /// </summary>
 public class ValidationSummary
 {
-    /// <summary>
-    /// 是否通过验证
-    /// </summary>
     public bool Passed { get; set; }
-    
-    /// <summary>
-    /// 验证轮次
-    /// </summary>
+    public bool Success { get; set; }
+    public string Output { get; set; } = "";
+    public int ErrorCount { get; set; }
+    public int WarningCount { get; set; }
     public int RoundsExecuted { get; set; }
-    
-    /// <summary>
-    /// 是否需要人工审查
-    /// </summary>
     public bool NeedsManualReview { get; set; }
-    
-    /// <summary>
-    /// 编译错误列表
-    /// </summary>
+    public List<CompilationError> Errors { get; set; } = new();
     public List<CompilationError> CompilationErrors { get; set; } = new();
-    
-    /// <summary>
-    /// 验证日志
-    /// </summary>
+    public List<string> Warnings { get; set; } = new();
     public List<string> ValidationLog { get; set; } = new();
 }
 
@@ -263,61 +147,35 @@ public class ValidationSummary
 /// </summary>
 public class ConversionIssue
 {
-    /// <summary>
-    /// 问题类型
-    /// </summary>
-    public IssueType Type { get; set; }
-    
-    /// <summary>
-    /// 问题严重程度
-    /// </summary>
-    public IssueSeverity Severity { get; set; }
-    
-    /// <summary>
-    /// 问题描述
-    /// </summary>
-    public string Description { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 位置（行号）
-    /// </summary>
+    public string Description { get; set; } = "";
+    public string Severity { get; set; } = "";
+    public int Line { get; set; }
     public int LineNumber { get; set; }
-    
-    /// <summary>
-    /// 原始代码片段
-    /// </summary>
-    public string? OriginalCode { get; set; }
-    
-    /// <summary>
-    /// 建议操作
-    /// </summary>
-    public string? Suggestion { get; set; }
-    
-    /// <summary>
-    /// 源语言
-    /// </summary>
-    public LanguageType Language { get; set; }
+    public string Suggestion { get; set; } = "";
+    public string SourceSyntax { get; set; } = "";
+    public string OriginalCode { get; set; } = "";
+    public string Type { get; set; } = "";
+    public string Language { get; set; } = "";
+    public int Column { get; set; }
+    public bool IsError { get; set; }
+    public string ErrorId { get; set; } = "";
 }
 
+// ==================== 项目模型 ====================
+
 /// <summary>
-/// 问题严重程度
+/// 项目信息
 /// </summary>
-public enum IssueSeverity
+public class ProjectInfo
 {
-    /// <summary>
-    /// 低优先级
-    /// </summary>
-    Low = 0,
-    
-    /// <summary>
-    /// 中优先级
-    /// </summary>
-    Medium = 1,
-    
-    /// <summary>
-    /// 高优先级
-    /// </summary>
-    High = 2
+    public Guid Id { get; set; }
+    public string Name { get; set; } = "";
+    public string SourceLanguage { get; set; } = "";
+    public string TargetLanguage { get; set; } = "";
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+    public List<string> Files { get; set; } = new();
+    public int TotalConversions { get; set; }
 }
 
 /// <summary>
@@ -325,56 +183,12 @@ public enum IssueSeverity
 /// </summary>
 public enum IssueType
 {
-    /// <summary>
-    /// 不可转换语法
-    /// </summary>
-    UnconvertibleSyntax = 0,
-    
-    /// <summary>
-    /// 类型映射警告
-    /// </summary>
-    TypeMappingWarning = 1,
-    
-    /// <summary>
-    /// API 差异
-    /// </summary>
-    ApiDifference = 2,
-    
-    /// <summary>
-    /// 语义差异
-    /// </summary>
-    SemanticDifference = 3,
-    
-    /// <summary>
-    /// 性能考虑
-    /// </summary>
-    PerformanceConsideration = 4
-}
-
-/// <summary>
-/// 转换日志
-/// </summary>
-public class TransformationLog
-{
-    /// <summary>
-    /// 时间戳
-    /// </summary>
-    public DateTime Timestamp { get; set; }
-    
-    /// <summary>
-    /// 操作类型
-    /// </summary>
-    public string Operation { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 详情
-    /// </summary>
-    public string Details { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 日志级别
-    /// </summary>
-    public LogLevel Level { get; set; }
+    Syntax,
+    Semantic,
+    Compatibility,
+    Performance,
+    Maintainability,
+    UnconvertibleSyntax
 }
 
 /// <summary>
@@ -382,90 +196,42 @@ public class TransformationLog
 /// </summary>
 public enum LogLevel
 {
-    /// <summary>
-    /// 信息
-    /// </summary>
-    Info = 0,
-    
-    /// <summary>
-    /// 警告
-    /// </summary>
-    Warning = 1,
-    
-    /// <summary>
-    /// 错误
-    /// </summary>
-    Error = 2,
-    
-    /// <summary>
-    /// 调试
-    /// </summary>
-    Debug = 3
+    Debug,
+    Info,
+    Warning,
+    Error,
+    Critical
 }
 
 /// <summary>
-/// TODO 项
+/// 转换日志
 /// </summary>
-public class TodoItem
+public class TransformationLog
 {
-    /// <summary>
-    /// TODO 描述
-    /// </summary>
-    public string Description { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 位置（行号）
-    /// </summary>
-    public int LineNumber { get; set; }
-    
-    /// <summary>
-    /// 原始语法说明
-    /// </summary>
-    public string OriginalSyntax { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 为什么无法直接转换
-    /// </summary>
-    public string WhyNotDirect { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 推荐的替代方案
-    /// </summary>
-    public string RecommendedAlternative { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 参考代码位置
-    /// </summary>
-    public string? ReferenceLocation { get; set; }
+    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+    public string Operation { get; set; } = "";
+    public string Details { get; set; } = "";
+    public LogLevel Level { get; set; } = LogLevel.Info;
 }
 
 /// <summary>
-/// 编译错误
+/// 问题严重程度
 /// </summary>
-public class CompilationError
+public enum IssueSeverity
 {
-    /// <summary>
-    /// 错误 ID
-    /// </summary>
-    public string ErrorId { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 错误消息
-    /// </summary>
-    public string Message { get; set; } = string.Empty;
-    
-    /// <summary>
-    /// 行号
-    /// </summary>
-    public int LineNumber { get; set; }
-    
-    /// <summary>
-    /// 列号
-    /// </summary>
-    public int ColumnNumber { get; set; }
-    
-    /// <summary>
-    /// 错误级别（错误或警告）
-    /// </summary>
-    public bool IsError { get; set; } = true;
+    Low,
+    Medium,
+    High,
+    Critical
+}
+
+/// <summary>
+/// 修复选项
+/// </summary>
+public enum FixOption
+{
+    Replace,
+    Comment,
+    Annotate,
+    Remove
 }