AbstractMusic v0.1.4

Added

• Added a stdlib-only acemusic remote backend for ACE Music-compatible hosted text-to-music APIs.
• Added remote as a no-op optional extra and expanded all-apple / all-gpu profiles to include
  supported local runtime dependency groups.

Changed

• Changed the CLI and AbstractCore plugin default backend to lightweight remote generation
  (acemusic) so pip install abstractmusic remains remote-capable without local ML libraries.
• Standardized ACE Music remote configuration on ACEMUSIC_API_KEY and ACEMUSIC_BASE_URL.
• Documented that Suno is not included as a default backend until an official stable API contract is
  available; OpenAI and Anthropic are not treated as music-generation providers.