refactor: migrate to pnpm monorepo with Payload CMS backend and Astro frontend to support scalable website development and AI-assisted workflows

apps/backend/vitest.config.mts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+import tsconfigPaths from 'vite-tsconfig-paths'
+
+export default defineConfig({
+  plugins: [tsconfigPaths(), react()],
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./vitest.setup.ts'],
+    include: ['tests/int/**/*.int.spec.ts'],
+  },
+})