feat: scaffold Hono server with auth and health check

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/db.ts

@@ -0,0 +1,6 @@
+import { drizzle } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+import { env } from "./env.js";
+
+const client = postgres(env.DATABASE_URL);
+export const db = drizzle(client);