feat(statistics): 优化统计数据响应式与新增今日统计数据

- 将核心统计数据和待处理事项改为computed，确保响应式更新
- 使用ref管理待发货订单数、退款申请数和优惠券使用数
- 异步请求接口获取待处理事项的实际数据并更新状态
- 在统计模块中新增今日销售额、订单数和新增用户的安全获取逻辑
- 将今日统计数据纳入本地状态合并，提高数据完整性
- 修正今日统计显示逻辑，替换模拟数据为真实数据来源

src/store/modules/statistics.ts

@@ -183,7 +183,38 @@ export const useStatisticsStore = defineStore('statistics', {
           return 0;
         })();
 
-        // 安全获取总销售额，处理数组情况
+      // 安全获取今日销售额
+        const todaySales = (() => {
+          if (statisticsData && statisticsData.length > 0) {
+            const stats = statisticsData[0];
+            if (stats.todaySales !== undefined && stats.todaySales !== null) {
+              return safeNumber(stats.todaySales);
+            }
+          }
+          return 0;
+        })();
+
+        // 安全获取今日订单数
+        const todayOrders = (() => {
+          if (statisticsData && statisticsData.length > 0) {
+            const stats = statisticsData[0];
+            if (stats.todayOrders !== undefined && stats.todayOrders !== null) {
+              return safeNumber(stats.todayOrders);
+            }
+          }
+          return 0;
+        })();
+
+        // 安全获取今日新增用户
+        const todayUsers = (() => {
+          if (statisticsData && statisticsData.length > 0) {
+            const stats = statisticsData[0];
+            if (stats.todayUsers !== undefined && stats.todayUsers !== null) {
+              return safeNumber(stats.todayUsers);
+            }
+          }
+          return 0;
+        })();
         const totalSales = (() => {
           if (!total) {
             console.warn('⚠️ 订单总额API返回空数据');
@@ -224,13 +255,22 @@ export const useStatisticsStore = defineStore('statistics', {
             }, 1000);
 
             // 更新本地数据
-            statistics = { ...existingStatistics, ...updateData };
+            statistics = {
+              ...existingStatistics,
+              ...updateData,
+              todaySales,
+              todayOrders,
+              todayUsers
+            };
           } else {
             // 如果现有数据无效，使用基础数据
             statistics = {
               userCount: userCount,
               orderCount: orderCount,
-              totalSales: totalSales
+              totalSales: totalSales,
+              todaySales: todaySales,
+              todayOrders: todayOrders,
+              todayUsers: todayUsers
             };
           }
         } else {
@@ -238,7 +278,10 @@ export const useStatisticsStore = defineStore('statistics', {
           statistics = {
             userCount: userCount,
             orderCount: orderCount,
-            totalSales: totalSales
+            totalSales: totalSales,
+            todaySales: todaySales,
+            todayOrders: todayOrders,
+            todayUsers: todayUsers
           };
 
           // 异步保存到数据库