- Check if ACE-Step API is running at startup (GET /health)
- If API available: use REST endpoints (POST /release_task, POST /query_result, GET /v1/audio)
- Model is already loaded by the API server, no double initialization
- If API not available: fall back to Python spawn (existing behavior)
- Model loads once via Python script
This prevents the issue where running `acestep-api --port 8001` loads the model,
then the UI spawns Python which loads it again, consuming double VRAM.
API response is cached for the session to avoid repeated health checks.
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