feat: implement gas and delivery admin systems

frontend/delivery_admin/src/api/http.ts

@@ -0,0 +1,26 @@
+/** 配送点后台 HTTP 客户端，使用独立 API 前缀和 JWT 存储键。 */
+const apiBaseURL = import.meta.env.VITE_API_BASE_URL || 'http://localhost:12426/heqi/delivery/v1';
+
+export const tokenStorageKey = 'delivery_admin_token';
+
+export type PageResult<T> = { total: number; list: T[] };
+
+export async function request<T>(path: string, init?: RequestInit): Promise<T> {
+  const token = localStorage.getItem(tokenStorageKey);
+  let response: Response;
+  try {
+    response = await fetch(`${apiBaseURL}${path}`, {
+      ...init,
+      headers: {
+        'Content-Type': 'application/json',
+        ...(token ? { Authorization: token } : {}),
+        ...(init?.headers ?? {}),
+      },
+    });
+  } catch {
+    throw new Error('无法连接服务器，请确认服务已启动');
+  }
+  const payload = (await response.json()) as { code?: number; message?: string; details?: T };
+  if (!response.ok || payload.code !== 0) throw new Error(payload.message || '请求失败');
+  return payload.details as T;
+}