DI Refactor: Azure.Mcp.Tools.AppLens

[Copilot]

• Understand the DI refactor pattern from the example PR AppConfig: Remove usage of ServiceProvider in ExecuteAsync. #1815
• Refactor ResourceDiagnoseCommand to inject IAppLensService via constructor instead of context.GetService<T>()
• Update ResourceDiagnoseCommandTests to pass IAppLensService to the command constructor
• Build and tests pass (17/17)
• Add changelog entry with correct PR number (1884)

Original prompt

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This section details on the original issue you should resolve

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

Refactor Azure.Mcp.Tools.AppLens 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} = AppLens.

An example PR is: #1815</issue_description>

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

• Fixes DI Refactor: Azure.Mcp.Tools.AppLens #1835

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[Copilot]

Pull request overview

Refactors the AppLens tool’s ResourceDiagnoseCommand to follow the repo’s DI pattern by making IAppLensService an explicit constructor dependency (instead of resolving it from CommandContext), improving testability and reducing runtime coupling to ServiceProvider.

Changes:

• Inject IAppLensService into ResourceDiagnoseCommand via primary constructor and use the injected field in ExecuteAsync.
• Update ResourceDiagnoseCommandTests to construct the command with a mocked IAppLensService.
• Add a changelog entry documenting the AppLens DI/testability improvement.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tools/Azure.Mcp.Tools.AppLens/src/Commands/Resource/ResourceDiagnoseCommand.cs	Removes context.GetService<IAppLensService>() usage and uses constructor-injected IAppLensService.
tools/Azure.Mcp.Tools.AppLens/tests/Azure.Mcp.Tools.AppLens.UnitTests/Resource/ResourceDiagnoseCommandTests.cs	Updates unit tests to pass IAppLensService into the command constructor.
servers/Azure.Mcp.Server/changelog-entries/1772200000001.yaml	Adds changelog entry for the AppLens DI refactor (PR 1884).