feat(Resources): Add ResourcePackage system for asset bundling

- Implement ResourcePackageBuilder for creating .xcp packages
- Implement ResourcePackage for reading packaged assets
- Add unit tests for package builder and package reader

tests/Resources/CMakeLists.txt

@@ -21,6 +21,7 @@ set(RESOURCES_TEST_SOURCES
     test_audio_loader.cpp
     test_shader_loader.cpp
     test_material_loader.cpp
+    test_resource_package.cpp
 )
 
 add_executable(xcengine_resources_tests ${RESOURCES_TEST_SOURCES})

tests/Resources/test_resource_package.cpp

@@ -0,0 +1,75 @@
+#include <gtest/gtest.h>
+#include <XCEngine/Resources/ResourcePackage.h>
+#include <XCEngine/Containers/Array.h>
+#include <XCEngine/Core/Types.h>
+
+using namespace XCEngine::Resources;
+using namespace XCEngine::Containers;
+using namespace XCEngine::Core;
+
+namespace {
+
+TEST(ResourcePackageBuilder, DefaultConstructor) {
+    ResourcePackageBuilder builder;
+    EXPECT_TRUE(builder.GetOutputPath().Empty());
+    EXPECT_EQ(builder.GetProgress(), 0.0f);
+}
+
+TEST(ResourcePackageBuilder, SetOutputPath) {
+    ResourcePackageBuilder builder;
+    builder.SetOutputPath("test.pkg");
+    EXPECT_EQ(builder.GetOutputPath(), "test.pkg");
+}
+
+TEST(ResourcePackageBuilder, AddFile) {
+    ResourcePackageBuilder builder;
+    builder.SetOutputPath("test.pkg");
+    
+    bool result = builder.AddFile("nonexistent.txt", "test.txt");
+    EXPECT_FALSE(result);
+}
+
+TEST(ResourcePackageBuilder, BuildWithoutFiles) {
+    ResourcePackageBuilder builder;
+    builder.SetOutputPath("test.pkg");
+    
+    bool result = builder.Build();
+    EXPECT_FALSE(result);
+}
+
+TEST(ResourcePackage, DefaultConstructor) {
+    ResourcePackage pkg;
+    EXPECT_FALSE(pkg.IsValid());
+}
+
+TEST(ResourcePackage, OpenInvalidPath) {
+    ResourcePackage pkg;
+    bool result = pkg.Open("invalid/path/package.pkg");
+    EXPECT_FALSE(result);
+    EXPECT_FALSE(pkg.IsValid());
+}
+
+TEST(ResourcePackage, Exists) {
+    ResourcePackage pkg;
+    EXPECT_FALSE(pkg.Exists("test.txt"));
+}
+
+TEST(ResourcePackage, GetSize) {
+    ResourcePackage pkg;
+    EXPECT_EQ(pkg.GetSize("test.txt"), 0u);
+}
+
+TEST(ResourcePackage, Read) {
+    ResourcePackage pkg;
+    Array<XCEngine::Core::uint8> data = pkg.Read("test.txt");
+    EXPECT_EQ(data.Size(), 0u);
+}
+
+TEST(ResourcePackage, Enumerate) {
+    ResourcePackage pkg;
+    Array<String> files(10);
+    pkg.Enumerate("*.txt", files);
+    EXPECT_EQ(files.Size(), 0u);
+}
+
+} // namespace