DI Refactor: Azure.Mcp.Tools.MySql

[Copilot]

Refactors Azure.Mcp.Tools.MySql commands to use constructor dependency injection for IMySqlService instead of resolving it via context.GetService<T>() in ExecuteAsync. Sub-issue of #158.

Changes

Commands

All 6 command classes now accept IMySqlService via constructor and store it as a private readonly field, eliminating runtime service resolution:

// Before
public sealed class DatabaseQueryCommand(ILogger<DatabaseQueryCommand> logger) : BaseDatabaseCommand<DatabaseQueryOptions>(logger)
{
    public override async Task<CommandResponse> ExecuteAsync(...)
    {
        var mysqlService = context.GetService<IMySqlService>() ?? throw new InvalidOperationException("...");
        // ...
    }
}

// After
public sealed class DatabaseQueryCommand(ILogger<DatabaseQueryCommand> logger, IMySqlService mysqlService) : BaseDatabaseCommand<DatabaseQueryOptions>(logger)
{
    private readonly IMySqlService _mysqlService = mysqlService;

    public override async Task<CommandResponse> ExecuteAsync(...)
    {
        var result = await _mysqlService.ExecuteQueryAsync(...);
        // ...
    }
}

Affected commands: MySqlListCommand, DatabaseQueryCommand, ServerConfigGetCommand, ServerParamGetCommand, ServerParamSetCommand, TableSchemaGetCommand.

Tests

Removed IServiceProvider/ServiceCollection setup from all command test classes. Mock service is now passed directly to command constructors.

No setup changes needed

MySqlSetup.ConfigureServices already registers IMySqlService and all commands as singletons — the DI container resolves the new constructor dependency automatically.

Original prompt

---

This section details on the original issue you should resolve

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

Refactor Azure.Mcp.Tools.MySql 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} = MySql.

An example PR is: #1815
</issue_description>

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

• Fixes DI Refactor: Azure.Mcp.Tools.MySql #1863

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