Refactor render graph error handling and resource APIs

- RenderGraph.Compile/Execute now return Error for better failure detection; error handling is propagated throughout compiler and executor.
- Renamed ScheduleReleaseResource to ReleaseResource for clarity; updated all usages.
- ResourceManager now calls ReleaseResource directly on Mesh, Material, and Shader types.
- Camera exposes Actual/Virtual size properties and Render returns Error.
- RenderingContext now uses IResourceManager for mesh/resource ops.
- Replaced custom BinaryWriter with BufferWriter in RenderGraphHasher.
- Improved variable naming, interface signatures, and code formatting.
- Added Error extension for IsSuccess/IsFailure.
- Minor FMOD/native interop and test code cleanups.
- No breaking API changes except for new Error return values on some methods.

src/Test/Ghost.UnitTest/AssetDatabaseIntegrationTest.cs

@@ -1,5 +1,3 @@
-using Ghost.Editor.Core.AssetHandle;
-using Ghost.Data.Services;
 using Ghost.Core;
 
 namespace Ghost.UnitTest;
@@ -330,7 +328,7 @@ public class AssetDatabaseIntegrationTest
         var tasks = new List<Task>();
         var fileNames = new List<string>();
 
-        for (int i = 0; i < 10; i++)
+        for (var i = 0; i < 10; i++)
         {
             var fileName = $"race{i}.txt";
             fileNames.Add(fileName);

src/Test/Ghost.UnitTest/AssetMetaTest.cs

@@ -1,5 +1,3 @@
-using Ghost.Editor.Core.AssetHandle;
-using Ghost.Editor.Core.AssetHandle.Importers;
 using System.Text.Json;
 
 namespace Ghost.UnitTest;