fix: 菌群报告异常指标统一红色显示

偏低/缺乏/不足状态原本橙色显示，现统一改为红色 #C62828，与偏高/过多/异常一致。

cfc-frontend/pages/health/gut-flora-detail.vue

@@ -724,9 +724,9 @@ export default {
 .val-text { font-size: 28rpx; font-weight: 600; color: #333; }
 .val-high { color: #C62828; }
 .val-excess { color: #C62828; }
-.val-low { color: #E65100; }
-.val-deficient { color: #E65100; }
-.val-insufficient { color: #E65100; }
+.val-low { color: #C62828; }
+.val-deficient { color: #C62828; }
+.val-insufficient { color: #C62828; }
 .val-abnormal { color: #C62828; }
 .val-warning { color: #F59E0B; }
 

cfc-frontend/pages/health/gut-flora-species-detail.vue

@@ -241,9 +241,9 @@ export default {
 .flora-name { font-size: 28rpx; font-weight: 600; color: #333; flex: 1; }
 .flora-name.status-high { color: #C62828; }
 .flora-name.status-excess { color: #C62828; }
-.flora-name.status-low { color: #E65100; }
-.flora-name.status-deficient { color: #E65100; }
-.flora-name.status-insufficient { color: #E65100; }
+.flora-name.status-low { color: #C62828; }
+.flora-name.status-deficient { color: #C62828; }
+.flora-name.status-insufficient { color: #C62828; }
 .arrow-up { color: #C62828; font-size: 22rpx; }
 .arrow-down { color: #E65100; font-size: 22rpx; }
 .flora-level-tag { padding: 2rpx 12rpx; background: #E3F2FD; border-radius: 16rpx; font-size: 20rpx; color: #4A9BD7; }