Register music assistant services in async setup

[arturpragacz]

Proposed change

Register music assistant services in async setup.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @music-assistant, mind taking a look at this pull request as it has been labeled with an integration (music_assistant) you are listed as a code owner for? Thanks!

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[Copilot]

Pull Request Overview

This PR refactors the Music Assistant integration by centralizing service-related code and improving code organization. The changes move platform entity service registrations from the media player module to a dedicated services module, and extract a reusable helper function into a separate helpers module.

• Centralized service definitions and registrations in services.py
• Extracted get_music_assistant_client helper to helpers.py for better code organization
• Updated imports across all affected files to reflect the new structure

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
homeassistant/components/music_assistant/services.py	Added platform entity service registrations (play_media, play_announcement, transfer_queue, get_queue) and imported necessary constants; imported get_music_assistant_client from helpers module
homeassistant/components/music_assistant/media_player.py	Removed platform entity service registrations and related imports that were moved to services.py; removed unused service constant definitions
homeassistant/components/music_assistant/helpers.py	Added get_music_assistant_client helper function moved from services.py with proper imports and type checking
homeassistant/components/music_assistant/init.py	Updated import to get get_music_assistant_client from helpers module instead of services module
tests/components/music_assistant/test_media_player.py	Updated imports to get service constants from services module instead of media_player module