fix(miniapp): 接单大厅分类数量取真实数据，抢单失败不再伪造订单

- 分类 chip 的 12/4/3 写死数量改为按真实订单统计

- 雷达页抢单失败时删除「自动落盘创建订单」兜底（原逻辑会伪造一笔 buyerId=2001 的订单并提示成功），改为如实提示已被抢/状态不可接/未认证

- 抢单使用当前登录身份（userId 由服务端 token 覆盖），成功后刷新列表

- 110 套件/730 用例全绿

pwuniapp/pages/expert/hall.vue

@@ -386,12 +386,14 @@ onUnmounted(() => {
 });
 
 
-const categories = ref([
-  { key: 'all', name: '全部可接', count: 12, icon: ICONS.gridAll },
-  { key: 'food', name: '同城美食', count: 4, icon: ICONS.utensils },
-  { key: 'drink', name: '清吧咖啡', count: 3, icon: ICONS.coffee },
-  { key: 'sing', name: 'KTV麦霸', count: 2, icon: ICONS.micVocal },
-  { key: 'game', name: '线上电竞', count: 3, icon: ICONS.gameCrosshair }
+const countByType = (cls: string) => orders.value.filter((o: any) => o.typeClass === cls).length;
+
+const categories = computed(() => [
+  { key: 'all', name: '全部可接', count: orders.value.length, icon: ICONS.gridAll },
+  { key: 'food', name: '同城美食', count: countByType('cat-food'), icon: ICONS.utensils },
+  { key: 'drink', name: '清吧咖啡', count: countByType('cat-drink'), icon: ICONS.coffee },
+  { key: 'sing', name: 'KTV麦霸', count: countByType('cat-sing'), icon: ICONS.micVocal },
+  { key: 'game', name: '线上电竞', count: countByType('cat-game'), icon: ICONS.gameCrosshair }
 ]);
 
 const orders = ref([]);