Implements a hint system that plays audio clips when specific game events occur:
- Ship status changes (fuel/hull/ammo thresholds)
- Asteroid destruction counts
- Ship collisions
Hints are stored in database with configurable play modes (once/always).
Also lowers background music volume from 0.5 to 0.2.
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Co-Authored-By: Claude <noreply@anthropic.com>
