feat(Resources): 添加资源系统基础框架

- ResourceTypes: 资源类型枚举、ResourceGUID生成
- IResource: 资源基类接口
- ResourceHandle: 资源句柄智能指针
- IResourceLoader: 加载器接口
- ResourceManager: 资源管理器(单例模式)
- ResourceCache: LRU缓存实现
- AsyncLoader: 异步加载器
- 测试框架: test_resource_types, test_resource_guid

Note: 当前与现有容器API存在编译差异,需要后续修复

tests/Resources/test_resource_guid.cpp

@@ -0,0 +1,62 @@
+#include <gtest/gtest.h>
+#include <XCEngine/Resources/ResourceTypes.h>
+
+using namespace XCEngine::Resources;
+
+namespace {
+
+TEST(Resources_GUID, DefaultConstructor) {
+    ResourceGUID guid;
+    EXPECT_FALSE(guid.IsValid());
+    EXPECT_EQ(guid.value, 0);
+}
+
+TEST(Resources_GUID, ValueConstructor) {
+    ResourceGUID guid(12345);
+    EXPECT_TRUE(guid.IsValid());
+    EXPECT_EQ(guid.value, 12345);
+}
+
+TEST(Resources_GUID, Generate_FromCString) {
+    ResourceGUID guid1 = ResourceGUID::Generate("textures/player.png");
+    ResourceGUID guid2 = ResourceGUID::Generate("textures/player.png");
+    
+    EXPECT_EQ(guid1, guid2);
+    EXPECT_TRUE(guid1.IsValid());
+}
+
+TEST(Resources_GUID, Generate_FromString) {
+    Containers::String path = "models/player.fbx";
+    ResourceGUID guid = ResourceGUID::Generate(path);
+    EXPECT_TRUE(guid.IsValid());
+}
+
+TEST(Resources_GUID, Generate_DifferentPaths) {
+    ResourceGUID guid1 = ResourceGUID::Generate("textures/a.png");
+    ResourceGUID guid2 = ResourceGUID::Generate("textures/b.png");
+    
+    EXPECT_NE(guid1, guid2);
+}
+
+TEST(Resources_GUID, ToString) {
+    ResourceGUID guid(0x1234567890ABCDEF);
+    Containers::String str = guid.ToString();
+    
+    EXPECT_EQ(str.Size(), 16u);
+}
+
+TEST(Resources_GUID, MakeResourceGUID_Helper) {
+    ResourceGUID guid = MakeResourceGUID("test/path");
+    EXPECT_TRUE(guid.IsValid());
+}
+
+TEST(Resources_GUID, EqualityOperators) {
+    ResourceGUID guid1(100);
+    ResourceGUID guid2(100);
+    ResourceGUID guid3(200);
+    
+    EXPECT_TRUE(guid1 == guid2);
+    EXPECT_TRUE(guid1 != guid3);
+}
+
+} // namespace