first commit

frontend/src/lib/api.ts

@@ -0,0 +1,21 @@
+import type { DashboardSnapshot } from '@/types'
+
+const envBaseUrl = import.meta.env.VITE_API_BASE_URL as string | undefined
+
+export const API_BASE = (envBaseUrl?.trim() || 'http://127.0.0.1:8001').replace(/\/$/, '')
+
+async function fetchJson<T>(path: string): Promise<T> {
+  const response = await fetch(`${API_BASE}${path}`)
+  if (!response.ok) {
+    throw new Error(`请求失败: ${response.status} ${response.statusText}`)
+  }
+  return response.json() as Promise<T>
+}
+
+export function fetchDashboardSnapshot() {
+  return fetchJson<DashboardSnapshot>('/api/dashboard/')
+}
+
+export function buildVideoFrameUrl(frameKey: number) {
+  return `${API_BASE}/api/video/frame/?frame=${frameKey}&t=${Date.now()}`
+}