Remove the redundant `Source` property from `IRelationship` and its
implementations. Since the relationship component is inherently
stored on the source entity, the `Source` field was unnecessary and
required manual synchronization during deserialization.
This change simplifies the relationship model, reduces memory usage,
and removes the need for reflection-based fixups in the serializer.
Implement the core CardWars game logic using an ECS-based architecture.
This includes:
- Card effect registry and various card effect implementations.
- Game phase management (Setup, Play, Flip, Scoring, Cleanup).
- Command system for player actions (PlayCard, FlipCard, etc.).
- Component-based game state and entity relationships.
- Automated game setup and scoring systems.
- Unit tests for game setup, card effects, and play logs.
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