Implement playable Mac client and rendering validation

libgr2/include/gr2/types.h

@@ -45,12 +45,17 @@ struct TriGroup {
 };
 
 struct Mesh {
+    struct BoneBounds {
+        float min[3] = {}, max[3] = {};
+        bool valid = false;
+    };
     std::string            name;
     VertexKind             kind = VertexKind::Unknown;
     std::vector<Vertex>    vertices;
     std::vector<uint32_t>  indices;      // 三角形列表
     std::vector<TriGroup>  tri_groups;
     std::vector<int32_t>   bone_bindings; // mesh 局部骨骼槽 → skeleton 骨骼索引
+    std::vector<BoneBounds> bone_bounds; // Parallel source BoneBindings OBBMin/OBBMax.
 	uint32_t               source_bone_weight_slots = 0; // 顶点类型声明值；审计 >4/8 权重
 	uint32_t               source_bone_index_slots = 0;  // packed UInt32 记为 4
     // 与 granny_mesh.MaterialBindings 平行：每项 = 解析出的漫反射贴图文件名