Implement car reservation schedule management system

Co-authored-by: pdf114514 <57948770+pdf114514@users.noreply.github.com>
Agent-Logs-Url: https://github.com/pdf114514/CarReservation/sessions/1d8c6b05-0e8d-4484-a2d8-8d427dfad9cb

frontend/src/api.js

@@ -0,0 +1,27 @@
+const API_BASE = '/api';
+
+async function request(path, options = {}) {
+  const res = await fetch(`${API_BASE}${path}`, {
+    headers: { 'Content-Type': 'application/json' },
+    ...options,
+  });
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ error: 'Unknown error' }));
+    throw new Error(err.error || `HTTP ${res.status}`);
+  }
+  return res.json();
+}
+
+export const api = {
+  // Cars
+  getCars: () => request('/cars'),
+  createCar: (data) => request('/cars', { method: 'POST', body: JSON.stringify(data) }),
+  updateCar: (id, data) => request(`/cars/${id}`, { method: 'PUT', body: JSON.stringify(data) }),
+  deleteCar: (id) => request(`/cars/${id}`, { method: 'DELETE' }),
+
+  // Reservations
+  getReservations: () => request('/reservations'),
+  createReservation: (data) => request('/reservations', { method: 'POST', body: JSON.stringify(data) }),
+  updateReservation: (id, data) => request(`/reservations/${id}`, { method: 'PUT', body: JSON.stringify(data) }),
+  deleteReservation: (id) => request(`/reservations/${id}`, { method: 'DELETE' }),
+};