feat(v1): add basic backend and frontend

frontend/src/App.real-render.test.jsx

@@ -0,0 +1,9 @@
+import { render, screen } from "@testing-library/react";
+import App from "./App.jsx";
+
+describe("App real render", () => {
+  it("mounts without mocking third-party components", () => {
+    render(<App />);
+    expect(screen.getByText("Spatial Image Enhancer Pro")).toBeInTheDocument();
+  });
+});