feat(admin): implement order management and statistics with real database integration

services/orderService.uts

@@ -1,5 +1,33 @@
 import { rpcOrNull, rpcOrEmptyArray, rpcOrValue } from '@/services/analytics/rpc.uts'
 
+export async function fetchOrderPage(
+  page: number,
+  pageSize: number,
+  orderStatus: number | null = null,
+  search: string | null = null,
+  startTime: string | null = null,
+  endTime: string | null = null
+): Promise<{ total: number; items: Array<any> }> {
+  const res = await rpcOrNull('rpc_admin_order_list', {
+    p_page: page,
+    p_page_size: pageSize,
+    p_order_status: orderStatus,
+    p_search: search,
+    p_start_time: startTime,
+    p_end_time: endTime
+  } as any)
+
+  if (res == null) return { total: 0, items: [] as Array<any> }
+
+  const anyTotal = (res as any).total
+  const anyItems = (res as any).items
+
+  const total = typeof anyTotal === 'number' ? anyTotal : parseInt(String(anyTotal ?? '0'))
+  const items = Array.isArray(anyItems) ? (anyItems as Array<any>) : ([] as Array<any>)
+
+  return { total, items }
+}
+
 export async function fetchRefundOrderPage(
   page: number,
   pageSize: number,
@@ -70,6 +98,22 @@ export async function fetchCashierOrderPage(
   return { total, items }
 }
 
+export async function fetchOrderStats(startTime: string, endTime: string): Promise<any | null> {
+  const res = await rpcOrNull('rpc_admin_order_stats', {
+    p_start_time: startTime,
+    p_end_time: endTime
+  } as any)
+  return res as any
+}
+
+export async function fetchOrderTrend(startTime: string, endTime: string, groupBy: string = 'day'): Promise<Array<any>> {
+  return (await rpcOrEmptyArray('rpc_admin_order_trend', {
+    p_start_time: startTime,
+    p_end_time: endTime,
+    p_group_by: groupBy
+  } as any)) as any
+}
+
 export async function fetchOrderSourceStats(startTime: string, endTime: string): Promise<Array<any>> {
   return (await rpcOrEmptyArray('rpc_admin_order_source_stats', {
     p_start_time: startTime,