Rename namespaces and project names from Playground to TestClone

[Copilot]

All Playground.* identifiers were mismatched with the repository name test.clone. This renames everything to TestClone.* for consistency.

Changes

• Solution file: playground.slnx → test.clone.slnx
• All 5 .csproj files: AssemblyName and RootNamespace updated (Playground.* → TestClone.*)
• All C# source files: namespace declarations and using directives updated
• Controller: PlaygroundController → TestCloneController (file renamed accordingly)
• Tests: PlaygroundControllerTests → TestCloneControllerTests (file renamed accordingly)
• Docs: README.md and docs/architecture.md updated to reflect new names

Example

// Before
namespace Playground.WebApi
{
    public class PlaygroundController(IFacade facade) : ControllerBase { ... }
}

// After
namespace TestClone.WebApi
{
    public class TestCloneController(IFacade facade) : ControllerBase { ... }
}

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Related Issues

Testing

• I have tested these changes locally
• New tests have been added/updated

Screenshots/Examples (if applicable)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests passed locally with my changes

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