feat(ops): 新增当月vs上月工单趋势对比数据（monthlyTrendData）

在 DashboardStatsRespVO 中新增 MonthlyTrendData/MonthData 内部类，
在 OpsStatisticsServiceImpl 中新增 buildMonthlyTrendData 方法，
复用已有的 selectCreatedCountGroupByDate 查询按日统计当月和上月每日创建工单数。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

viewsh-module-ops/viewsh-module-ops-biz/src/main/java/com/viewsh/module/ops/controller/admin/workorder/vo/statistics/DashboardStatsRespVO.java

@@ -48,6 +48,9 @@ public class DashboardStatsRespVO {
     @Schema(description = "工牌队列统计（近7天每天的排队数量）")
     private BadgeQueueStats badgeQueueStats;
 
+    @Schema(description = "当月与上月工单趋势对比")
+    private MonthlyTrendData monthlyTrendData;
+
     @Data
     @Builder
     @NoArgsConstructor
@@ -135,4 +138,26 @@ public class DashboardStatsRespVO {
         private List<Integer> queueData;
     }
 
+    @Data
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class MonthlyTrendData {
+        @Schema(description = "当月数据")
+        private MonthData currentMonth;
+        @Schema(description = "上月数据")
+        private MonthData lastMonth;
+    }
+
+    @Data
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class MonthData {
+        @Schema(description = "日期列表")
+        private List<String> dates;
+        @Schema(description = "每日创建工单数")
+        private List<Integer> createdData;
+    }
+
 }

viewsh-module-ops/viewsh-module-ops-biz/src/main/java/com/viewsh/module/ops/service/statistics/OpsStatisticsServiceImpl.java

@@ -142,6 +142,9 @@ public class OpsStatisticsServiceImpl implements OpsStatisticsService {
         // 11. 工牌队列统计（近7天每天排队的工单数 = QUEUED 状态）
         BadgeQueueStats badgeQueueStats = buildBadgeQueueStats(orderType, sevenDaysAgo, LocalDate.now());
 
+        // 12. 当月 vs 上月工单趋势对比
+        MonthlyTrendData monthlyTrendData = buildMonthlyTrendData(orderType);
+
         return DashboardStatsRespVO.builder()
                 .pendingCount(pendingCount)
                 .inProgressCount(inProgressCount)
@@ -154,6 +157,7 @@ public class OpsStatisticsServiceImpl implements OpsStatisticsService {
                 .heatmapData(heatmapData)
                 .functionTypeRanking(functionTypeRanking)
                 .badgeQueueStats(badgeQueueStats)
+                .monthlyTrendData(monthlyTrendData)
                 .build();
     }
 
@@ -1047,4 +1051,54 @@ public class OpsStatisticsServiceImpl implements OpsStatisticsService {
         return map;
     }
 
+    /**
+     * 构建当月 vs 上月工单趋势对比数据
+     */
+    private MonthlyTrendData buildMonthlyTrendData(String orderType) {
+        LocalDate today = LocalDate.now();
+        LocalDate currentMonthStart = today.withDayOfMonth(1);
+
+        // 上月：上月1日 ~ 上月末
+        LocalDate lastMonthStart = currentMonthStart.minusMonths(1);
+        LocalDate lastMonthEnd = currentMonthStart.minusDays(1);
+
+        DashboardStatsRespVO.MonthData currentMonth = buildMonthData(orderType, currentMonthStart, today);
+        DashboardStatsRespVO.MonthData lastMonth = buildMonthData(orderType, lastMonthStart, lastMonthEnd);
+
+        return MonthlyTrendData.builder()
+                .currentMonth(currentMonth)
+                .lastMonth(lastMonth)
+                .build();
+    }
+
+    /**
+     * 构建指定日期范围的每日创建工单数据
+     */
+    private DashboardStatsRespVO.MonthData buildMonthData(String orderType, LocalDate startDate, LocalDate endDate) {
+        LocalDateTime startDateTime = startDate.atStartOfDay();
+        LocalDateTime endDateTime = endDate.plusDays(1).atStartOfDay();
+
+        List<DateCountRespVO> rows = opsOrderMapper.selectCreatedCountGroupByDate(
+                orderType, startDateTime, endDateTime);
+        Map<String, Integer> countMap = rows.stream()
+                .collect(Collectors.toMap(
+                        row -> row.getStatDate().toString(),
+                        row -> row.getCnt().intValue(),
+                        (a, b) -> a
+                ));
+
+        List<String> dates = new ArrayList<>();
+        List<Integer> createdData = new ArrayList<>();
+
+        for (LocalDate d = startDate; !d.isAfter(endDate); d = d.plusDays(1)) {
+            dates.add(d.toString()); // yyyy-MM-dd 格式
+            createdData.add(countMap.getOrDefault(d.toString(), 0));
+        }
+
+        return DashboardStatsRespVO.MonthData.builder()
+                .dates(dates)
+                .createdData(createdData)
+                .build();
+    }
+
 }