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Extract component logic to C# extension properties

Refactored all computed properties and methods from component structs
to extension methods, maintaining ECS principle of pure data components.

**Changes:**
- Transform2D: Moved Matrix(), Forward(), Right() to Transform2DExtensions
- Transform3D: Moved Matrix(), Forward(), Right(), Up() to Transform3DExtensions
- SpatialBounds: Moved Center(), Extents(), Size(), Contains(), Intersects(),
  Encapsulate() to SpatialBoundsExtensions (made Encapsulate immutable)
- Velocity2D: Moved Magnitude(), MagnitudeSquared() to Velocity2DExtensions
- Velocity3D: Moved Magnitude(), MagnitudeSquared() to Velocity3DExtensions
- Camera: Moved GetProjectionMatrix() and GetViewMatrix() to CameraExtensions
  as ProjectionMatrix() and ViewMatrix()

**Test Updates:**
- Updated all test files to use extension method syntax
- Fixed SpatialBounds.Encapsulate tests to handle immutable pattern

**System Updates:**
- Updated RenderSystem to use new extension method syntax

This ensures components remain pure data containers with no logic,
following strict ECS architectural principles.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Tyler Coles <tyevco@users.noreply.github.com>

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