Add RequiresStop interface and improve actor cleanup

[molon]

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[Copilot]

Pull Request Overview

This PR introduces a RequiresStop interface to improve actor cleanup handling in the lifecycle package. The interface allows actors to indicate they need cleanup even if their Start method was never called, which is useful for actors that acquire resources during construction.

• Adds RequiresStop interface with RequiresStop() bool method
• Implements RequiresStop in FuncActor for actors with nil start but non-nil stop functions
• Refactors cleanup logic to use a single defer block that handles both started actors and RequiresStop actors

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
lifecycle/lifecycle.go	Adds RequiresStop interface and refactors Serve method to use unified cleanup logic
lifecycle/func.go	Implements RequiresStop method in FuncActor
lifecycle/lifecycle_test.go	Adds comprehensive tests for RequiresStop cleanup scenarios

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