feat: complete TASK-WP0-01 toolchain skeleton

apps/api/src/app.ts

@@ -0,0 +1,17 @@
+import swagger from "@fastify/swagger";
+import Fastify from "fastify";
+
+export function createApp() {
+  const app = Fastify({ logger: false });
+
+  void app.register(swagger, {
+    openapi: {
+      info: {
+        title: "Dada P0-A",
+        version: "0.0.0",
+      },
+    },
+  });
+
+  return app;
+}