feat: complete train scheduling integration

cargo-types.service.ts

@@ -0,0 +1,10 @@
+import axios from 'axios';
+
+const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:3001';
+
+export const cargoTypesService = {
+  async getCargoTypes() {
+    const { data } = await axios.get(`${API_URL}/api/cargo-types`);
+    return data;
+  },
+};