test: add vitest

* feature(root): add vitest and some basic tests

* fix(test): after rebase + added referrars test and more sites

* fix(test): test broken after rebase

* fix(test): provide db url to make prisma happy

* fix tests

vitest.shared.ts

@@ -0,0 +1,27 @@
+import * as path from 'node:path';
+import { defineConfig } from 'vitest/config';
+
+export const getSharedVitestConfig = ({
+  __dirname: dirname,
+}: { __dirname: string }) => {
+  return defineConfig({
+    resolve: {
+      alias: {
+        '@': path.resolve(dirname, 'src'),
+      },
+    },
+    test: {
+      env: {
+        // Not used, just so prisma is happy
+        DATABASE_URL: 'postgresql://u:p@127.0.0.1:5432/db',
+      },
+      include: ['**/*.test.{js,mjs,cjs,ts,mts,cts,jsx,tsx}'],
+      browser: {
+        name: 'chromium',
+        provider: 'playwright',
+        headless: true,
+      },
+      fakeTimers: { toFake: undefined },
+    },
+  });
+};