Change default resource directory from Resources to Attachments

[Copilot]

In C# projects, .resx files and their referenced resources conventionally reside in a Resources directory. Using the same directory for LuYao.ResourcePacker causes files to be packaged twice—once by the .resx system and once by this library.

Changes

Core library:

• Changed default ResourcePackerDirectory from "Resources" to "Attachments" in:
  • ResourcePackerTask.cs
  • ResourcePackageGenerator.cs
  • LuYao.ResourcePacker.MSBuild.props

Documentation:

• Updated README with new default and backward compatibility note
• Updated example project READMEs

Examples:

• Renamed Resources/ → Attachments/ in all 7 example projects
• Updated .csproj file references

Backward Compatibility

Users can override via MSBuild property:

<PropertyGroup>
    <ResourcePackerDirectory>Resources</ResourcePackerDirectory>
</PropertyGroup>

Rationale

Attachments is semantically appropriate for supplementary files "attached" to the application. It follows C# PascalCase conventions and won't conflict with standard resource management.

• Fixes 在 C# 项目中，默认的资源文件就是保存在 Resources 目录，这导致 .ResX 引用的文件被二次打包。 #47

Original prompt

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This section details on the original issue you should resolve

<issue_title>在 C# 项目中，默认的资源文件就是保存在 Resources 目录，这导致 .ResX 引用的文件被二次打包。</issue_title>
<issue_description>在 C# 项目中，默认的资源文件就是保存在 Resources 目录，这导致 .ResX 引用的文件被二次打包。我们是否修改一下规则，不使用 Resources 做为打包目录呢？

如果不适用 Resources 作为目录名，那应该用什么呢？</issue_description>

<agent_instructions>Android 项目因为是小写命名，他的目录名称是 res 。但是在 C# 目录中使用小写的 res 似乎不合适。</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes 在 C# 项目中，默认的资源文件就是保存在 Resources 目录，这导致 .ResX 引用的文件被二次打包。 #47

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[Soar360]

@copilot 我感觉 Assets 也不太合适，是否 Attachments 更符合语义呢？

[Copilot]

@copilot 我感觉 Assets 也不太合适，是否 Attachments 更符合语义呢？

Changed from "Assets" to "Attachments" as suggested. The change is more semantically appropriate for supplementary resource files. Commit d440348