refactor: execution handling to use Executor class instead of Runner

[ChiragAgg5k]

wraps runner class with a Executor class to handle createExecution

allows us to override the executor resource to better handle how createExecution should work for static vs ssr images

[Copilot]

Pull Request Overview

This PR refactors the execution handling system to use a new Executor class instead of directly using the Runner class. The change introduces a cleaner abstraction layer while maintaining the same underlying Docker runner functionality.

Key changes:

• Introduces a new Executor class that extends the existing Docker Runner
• Updates dependency injection to use Executor instead of Runner in controllers
• Maintains backward compatibility by keeping the existing Runner instance available

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Executor/Executor.php	Creates new Executor class that extends Docker Runner
app/http.php	Adds Executor instantiation and resource registration alongside existing Runner
app/controllers.php	Updates controller to inject and use Executor instead of Runner

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