docs: Add SpectrogramResourceManager to audio refactor plan

Updated AUDIO_LIFECYCLE_REFACTOR.md to explicitly address asset/procedural
spectrogram handling and AssetManager relationship.

Key additions:
- SpectrogramResourceManager component separates resource loading from sequencing
- Clear ownership rules: AssetManager owns assets, ResourceManager owns procedurals
- Unified interface for both asset and procedural spectrograms
- Reduces Tracker responsibility to pattern sequencing only
- FAQ section answering common questions about dependencies and caching

Architecture change:
  AudioEngine → { Synth, Tracker, ResourceManager }
  ResourceManager → { AssetManager, ProceduralGenerator }

This addresses the concern about coupling between tracker, synth, and assets.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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