DI Refactor: Azure.Mcp.Tools.KeyVault

[Copilot]

Refactors Azure.Mcp.Tools.KeyVault commands to receive IKeyVaultService via constructor injection rather than resolving it from context.GetService<T>() inside ExecuteAsync. Part of the broader DI refactor tracked in #158.

Commands updated

• KeyGetCommand, KeyCreateCommand
• SecretGetCommand, SecretCreateCommand
• CertificateGetCommand, CertificateCreateCommand, CertificateImportCommand
• AdminSettingsGetCommand

Pattern applied

Before:

public sealed class KeyGetCommand(ILogger<KeyGetCommand> logger) : SubscriptionCommand<KeyGetOptions>
{
    public override async Task<CommandResponse> ExecuteAsync(...)
    {
        var keyVaultService = context.GetService<IKeyVaultService>();
        // ...
    }
}

After:

public sealed class KeyGetCommand(ILogger<KeyGetCommand> logger, IKeyVaultService keyVaultService) : SubscriptionCommand<KeyGetOptions>
{
    private readonly IKeyVaultService _keyVaultService = keyVaultService;

    public override async Task<CommandResponse> ExecuteAsync(...)
    {
        // uses _keyVaultService directly
    }
}

Tests

Unit test constructors updated to pass the IKeyVaultService substitute directly to the command, removing the need to register it in a ServiceCollection.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>DI Refactor: Azure.Mcp.Tools.KeyVault</issue_title>
<issue_description>## Summary

Refactor Azure.Mcp.Tools.KeyVault to use constructor dependency injection instead of resolving services via context.GetService<T>() in ExecuteAsync.

This is a sub-issue of #158.

Instructions

Follow the algorithm described in tools/di-refactor-plan.md with {ToolArea} = KeyVault.

An example PR is: #1815
</issue_description>

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

• Fixes DI Refactor: Azure.Mcp.Tools.KeyVault #1857

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