Add initial project structure with database setup, logging, and workflow management

db.js

@@ -0,0 +1,11 @@
+import knex from "knex";
+import config from "./knexfile.js";
+
+export const db = knex(config);
+
+/**
+ * Apply pending migrations. Call once before registering workflows.
+ */
+export async function migrate() {
+  await db.migrate.latest();
+}