feat: add frontend app routing

frontend/src/lib/api.ts

@@ -0,0 +1,17 @@
+const API_BASE_URL = import.meta.env.VITE_API_BASE_URL ?? 'http://localhost:8000/api'
+
+export async function apiRequest<T>(path: string, init?: RequestInit): Promise<T> {
+  const response = await fetch(`${API_BASE_URL}${path}`, {
+    headers: {
+      'content-type': 'application/json',
+      ...init?.headers
+    },
+    ...init
+  })
+
+  if (!response.ok) {
+    throw new Error(`API request failed: ${response.status}`)
+  }
+
+  return response.json() as Promise<T>
+}

frontend/src/lib/format.ts

@@ -0,0 +1,6 @@
+export function formatDateTime(value: string) {
+  return new Intl.DateTimeFormat('zh-CN', {
+    dateStyle: 'medium',
+    timeStyle: 'short'
+  }).format(new Date(value))
+}