feat: shop detection from URL + vitest setup

vitest.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config'
+import path from 'node:path'
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    include: ['tests/**/*.test.ts'],
+  },
+  resolve: { alias: { '@': path.resolve(__dirname, './src') } },
+})