feat: add eSceneType enum, filter scene graph to general scenes, zone parsing improvements

- Add eSceneType enum (General, Audio) replacing raw uint32_t in SceneRef
- Filter BuildSceneGraph to only include General scenes
- Skip transitions referencing non-general scenes in adjacency graph
- Rename SceneRef unknown fields to scenePosition/sceneRadius
- Zone parsing and Level improvements

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dZoneManager/dZMCommon.h

@@ -4,6 +4,20 @@
 #include "NiQuaternion.h"
 #include "LDFFormat.h"
 #include <vector>
+#include <string>
+#include <array>
+
+struct RenderAttr {
+	std::string name;
+	uint32_t numFloats{};
+	bool isColor{};
+	std::array<float, 4> values{};
+};
+
+struct RenderTechnique {
+	std::string name;
+	std::vector<RenderAttr> attrs;
+};
 
 struct SceneObject {
 	LWOOBJID id;
@@ -13,7 +27,7 @@ struct SceneObject {
 	NiPoint3 position;
 	NiQuaternion rotation = QuatUtils::IDENTITY;
 	float scale = 1.0f;
-	uint32_t value3;
+	RenderTechnique renderTechnique;
 	LwoNameValue settings;
 };