Bootstrap monorepo: Hono API, React PWA, Drizzle DB, CI/CD

Sets up the initial project structure for groombook/groombook:

- pnpm monorepo with apps/api (Hono + TypeScript), apps/web (React + Vite + PWA), packages/db (Drizzle ORM), packages/types (shared types)
- Core DB schema: clients, pets, services, appointments, staff with CNPG-compatible Postgres
- REST API routes for clients, pets, services, appointments with Zod validation
- OIDC auth middleware for Authentik integration
- React PWA with vite-plugin-pwa, service worker, offline caching, installable manifest
- GitHub Actions CI: lint, typecheck, test, build, Docker image build (groombook-runners)
- Dockerfiles for API (Node.js) and Web (nginx)
- docker-compose.yml for local development

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/src/index.ts

@@ -0,0 +1,18 @@
+import { drizzle } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+import * as schema from "./schema.js";
+
+export * from "./schema.js";
+
+let _db: ReturnType<typeof drizzle> | null = null;
+
+export function getDb() {
+  if (_db) return _db;
+  const url = process.env.DATABASE_URL;
+  if (!url) throw new Error("DATABASE_URL is not set");
+  const client = postgres(url, { max: 10 });
+  _db = drizzle(client, { schema });
+  return _db;
+}
+
+export type Db = ReturnType<typeof getDb>;