chore: scaffold Nuxt 4 app with Postgres, tooling and health route

Nuxt 4 (app/ structure) + TypeScript, ESLint, Vitest + @nuxt/test-utils,
Drizzle + pg, a /api/health route with a DB ping, and a dev docker-compose
(app + Postgres). Verified: pnpm test, lint, and build pass; the built
server answers /api/health.

.env.example

@@ -0,0 +1,15 @@
+# App
+NUXT_SESSION_SECRET=change-me
+
+# Database (Postgres) — Coolify-managed in prod, docker-compose in dev
+DATABASE_URL=postgres://andon:andon@localhost:5432/andon
+
+# Google OAuth (Task 9) — restricted to the theodo.com hosted domain
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+GOOGLE_REDIRECT_URI=
+
+# Web Push / VAPID (Task 10)
+VAPID_PUBLIC_KEY=
+VAPID_PRIVATE_KEY=
+VAPID_SUBJECT=mailto:owner@theodo.com