fix(py314-compatibility): replace ensure_future calls by create_task

[rcollas]

Summary

Updates the codebase to support Python 3.14 by removing the deprecated loop parameter from asyncio functions and replacing asyncio.ensure_future() with loop.create_task() where appropriate. Maintains backward compatibility with Python 3.9+.

Changes

Production Code

• mode/services.py:

  • add_future(), _AwaitableService.on_start(): Use loop.create_task() for spawning new tasks
  • wait_many(), wait_first(), _wait_stopped(): Keep asyncio.ensure_future() (without loop param) to handle both coroutines and existing Tasks/Futures

• mode/worker.py:

  • _schedule_shutdown(), execute_from_commandline(), _shutdown_loop(): Use loop.create_task()

• mode/utils/logging.py:

  • flight_recorder.activate(): Use loop.create_task()

Fixes #4