圆饼图下周期方案初始数据与实时方案保持一致，移除随机偏移

src/components/ui/CrossingDetailPanel.vue

@@ -289,10 +289,10 @@ export default {
             ];
             this.realtimeRemaining = this.cycleLength;
 
-            // 下周期方案：4个阶段，时长随机微调 ±3s
+            // 下周期方案：4个阶段，初始数据与实时方案相同
             this.nextCycleDonutData = stages.map(s => ({
                 label: s.label,
-                value: Math.max(10, s.value + Math.floor(Math.random() * 7) - 3),
+                value: s.value,
                 color: s.color
             }));
         },