feat(render): support per-frame render payloads

Refactored the render pipeline system to introduce per-frame IRenderPayload management.
IRenderPipelineSettings now requires CreatePipeline and CreatePayload methods.
Updated RenderSystem and test pipeline to use the new payload model.
Removed legacy GhostRenderPipeline and test code.
Added RenderPipelineSystemAttribute for pipeline system registration.
Includes minor fixes such as version field type corrections and typo fixes.

BREAKING CHANGE: Render pipeline and payload creation APIs have changed; implementers must update to the new interface methods.

src/Runtime/Ghost.Entities/System.cs

@@ -31,10 +31,10 @@ public abstract class SystemBase : ISystem
         get; init;
     } = null!;
 
-    public int LastSystemVersion
+    public uint LastSystemVersion
     {
         get; internal set;
-    } = -2;
+    } = uint.MaxValue - 1;
 
     private bool ShouldUpdate()
     {