feat(db): add @atomcms/db package skeleton + mysql2/drizzle client

packages/db/vitest.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from "vitest/config";
+
+// Local config so Vitest does not walk up into the parent Laravel repo's
+// vite.config.js (this monorepo is nested inside the Laravel project).
+export default defineConfig({
+  test: {
+    environment: "node",
+  },
+});