feat: complete saleor core extensions app with React email templates

- Order confirmation, shipped, and cancelled email templates
- Uses @react-email/components for professional HTML emails
- Sends admin and customer notifications
- Integrates with Resend for email delivery
- Webhook handlers for ORDER_CREATED, ORDER_FULFILLED, ORDER_CANCELLED
- Docker image optimized for production
- Persistent auth data storage via PVC

vitest.config.ts

@@ -0,0 +1,17 @@
+import react from "@vitejs/plugin-react";
+import tsconfigPaths from "vite-tsconfig-paths";
+import { defineConfig } from "vitest/config";
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react(), tsconfigPaths()],
+  test: {
+    passWithNoTests: true,
+    environment: "jsdom",
+    setupFiles: "./src/setup-tests.ts",
+    css: false,
+    alias: {
+      "@/": new URL("./src/", import.meta.url).pathname,
+    },
+  },
+});