DI Refactor: Azure.Mcp.Tools.AppService

[Copilot]

Refactors Azure.Mcp.Tools.AppService commands to use constructor dependency injection instead of resolving IAppServiceService via context.GetService<T>() in ExecuteAsync. Part of #158.

Commands updated

• WebappGetCommand
• DatabaseAddCommand
• AppSettingsGetCommand
• AppSettingsUpdateCommand

Pattern applied

Before:

public sealed class WebappGetCommand(ILogger<WebappGetCommand> logger) : BaseAppServiceCommand<BaseAppServiceOptions>()
{
    public override async Task<CommandResponse> ExecuteAsync(...)
    {
        var appServiceService = context.GetService<IAppServiceService>();
        var webapps = await appServiceService.GetWebAppsAsync(...);
    }
}

After:

public sealed class WebappGetCommand(ILogger<WebappGetCommand> logger, IAppServiceService appServiceService) : BaseAppServiceCommand<BaseAppServiceOptions>()
{
    private readonly IAppServiceService _appServiceService = appServiceService;

    public override async Task<CommandResponse> ExecuteAsync(...)
    {
        var webapps = await _appServiceService.GetWebAppsAsync(...);
    }
}

Tests updated

All unit tests updated to pass IAppServiceService directly to the command constructor, removing the ServiceCollection-based service provider setup previously used to satisfy context.GetService<T>().

Additional changes

• Added AppServiceSetup to CommandFactoryHelpers.cs in the core unit tests so the factory correctly wires up AppService commands in integration-style tests.
• Added a changelog entry documenting the testability improvement.

Original prompt

---

This section details on the original issue you should resolve

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

Refactor Azure.Mcp.Tools.AppService 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} = AppService.

An example PR is: #1815</issue_description>

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

• Fixes DI Refactor: Azure.Mcp.Tools.AppService #1837

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[conniey]

@copilot Perform Step 4 and Step 5 from the refactor plan.

[Copilot]

Done in c6b9e13. Added AppServiceSetup to both arrays in CommandFactoryHelpers.cs (Step 4) and created a changelog entry at servers/Azure.Mcp.Server/changelog-entries/1772482309825.yaml (Step 5).