feat(runtimes): unify cleanup for all runtimes

[MkDev11]

Closes #3733

Description

Unifies cleanup for all runtimes (Fixes #3733).

• BaseRuntime: Added abstract cleanup(), default stop() (calls cleanup() and returns self), and __enter__/__exit__ so any runtime can be used with with runtime:.
• DaytonaRuntime: Renamed _cleanup() to cleanup(); stop() and __del__ call cleanup().
• RemoteHttpRuntime: Renamed _cleanup() to cleanup(); stop(), __del__, and atexit use cleanup().
• DockerRuntime: Added cleanup(remove=None) with stop/remove logic; stop(remove=None) calls cleanup().
• LLMGuardRuntime: Implemented no-op cleanup().

All runtimes now share a single cleanup contract and support context-manager usage.

Checklist

• I have read the CONTRIBUTION guide (required)
• I have linked this PR to an issue using the Development section on the right sidebar or by adding Fixes #issue-number in the PR description (required)
• I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock
• I have updated the tests accordingly (required for a bug fix or a new feature)
• I have updated the documentation if needed:
• I have added examples if this is a new feature

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[waleedalzarooni]

Great work @MkDev11,

Just a quick point to iron out before merging!

[bytecii]

Thanks. Left some comments. Also maybe we can add some unit tests?

[Wendong-Fan]

thanks @MkDev11 's contribution! some minor pre-commit issue need to be fixed, i will merge this PR first then would do enhance in another pr

[MkDev11]

thanks @MkDev11 's contribution! some minor pre-commit issue need to be fixed, i will merge this PR first then would do enhance in another pr

cool, also can you please review my pr #1003 on eigent?