feat: 完成第四批任务 (Task 6.2, 10.1-10.3)

Task 6.2 - 报告导出功能:
- ReportExportService: 报告导出服务
- ExportToMarkdown: Markdown 格式导出
- ExportToHtml: HTML 格式导出（可打印为 PDF）
- ExportToPdf: PDF 导出（HTML 包装）

Task 10.1-10.3 - 文档和打包:
- README.md: 项目主文档
- docs/USAGE.md: 使用指南（CLI 命令、API、Web 界面）
- docs/DEVELOPMENT.md: 开发指南（项目结构、构建、测试、部署）
- docs/API.md: API 参考文档（端点、认证、错误码）
- Dockerfile: Web API Docker 镜像
- docker-compose.yml: Docker Compose 配置
- .dockerignore: Docker 忽略文件
- NuGet 打包配置 (CodePlay.Core.csproj)

测试：42 个 (41 通过，1 跳过) ✅

新增文件:
- CodePlay.Core/Services/ReportExportService.cs
- README.md
- docs/USAGE.md
- docs/DEVELOPMENT.md
- docs/API.md
- Dockerfile
- docker-compose.yml
- .dockerignore
Co-authored-by: monkeycode-ai <monkeycode-ai@chaitin.com>

CodePlay.Core/CodePlay.Core.csproj

@@ -1,14 +1,30 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-  </PropertyGroup>
-
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <PackageId>CodePlay.Core</PackageId>
+    <Version>1.0.0</Version>
+    <Authors>CodePlay Team</Authors>
+    <Company>CodePlay</Company>
+    <Description>CodePlay - Professional code conversion engine for C# and Java</Description>
+    <Copyright>Copyright (c) 2026 CodePlay</Copyright>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageProjectUrl>https://github.com/your-org/codeplay</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/your-org/codeplay</RepositoryUrl>
+    <PackageTags>code-conversion csharp java migration refactoring</PackageTags>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
-    <PackageReference Include="TreeSitter" Version="0.1.0-alpha.1" />
-  </ItemGroup>
-
-</Project>
+    <PackageReference Include="TreeSitter" Version="1.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\README.md" Pack="true" PackagePath="\" />
+  </ItemGroup>
+
+</Project>