refactor(new_editor/app): reorganize host structure and add smoke test

new_editor/app/Support/ExecutablePath.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <filesystem>
+#include <vector>
+
+#include <windows.h>
+
+namespace XCEngine::UI::Editor::Support {
+
+inline std::filesystem::path GetExecutableDirectory() {
+    std::vector<wchar_t> buffer(MAX_PATH);
+    while (true) {
+        const DWORD copied = ::GetModuleFileNameW(
+            nullptr,
+            buffer.data(),
+            static_cast<DWORD>(buffer.size()));
+        if (copied == 0u) {
+            return std::filesystem::current_path().lexically_normal();
+        }
+
+        if (copied < buffer.size() - 1u) {
+            return std::filesystem::path(std::wstring(buffer.data(), copied))
+                .parent_path()
+                .lexically_normal();
+        }
+
+        buffer.resize(buffer.size() * 2u);
+    }
+}
+
+} // namespace XCEngine::UI::Editor::Support