fix(guest): health 访客态弱说明文字对比度达标（gh-section-note/demo-empty-sub/sep 三处 color 改 $facade-text-slate #6B7280，对白卡 4.83:1/暖页面底 4.74:1，达 WCAG 3:1）

cfc-frontend/pages/health-main/index.vue

@@ -1003,7 +1003,7 @@ $gh-file-bg:      str-slice('#{$dim-body-deep}', 2);
 .gh-section-tag { display: flex; flex-direction: row; align-items: center; margin: 0 0 20rpx 4rpx; }
 .gh-section-dot { width: 8rpx; height: 28rpx; border-radius: 4rpx; background: $brand-primary; }
 .gh-section-title { font-size: calc(30rpx * var(--font-scale, 1)); font-weight: 700; color: $facade-text-strong; margin-left: 12rpx; letter-spacing: 1rpx; }
-.gh-section-note { font-size: calc(22rpx * var(--font-scale, 1)); color: $facade-text-muted; margin-left: 4rpx; }
+.gh-section-note { font-size: calc(22rpx * var(--font-scale, 1)); color: $facade-text-slate; margin-left: 4rpx; }
 
 /* 待填调研 */
 .gh-pending { display: flex; flex-direction: row; align-items: center; padding: 24rpx; border-radius: $uni-radius-lg; background: $app-surface; border: 1rpx solid $app-border-subtle; }
@@ -1032,7 +1032,7 @@ $gh-file-bg:      str-slice('#{$dim-body-deep}', 2);
 .gh-demo-block:nth-child(2) .gh-demo-tag { color: $dim-wisdom-deep; background: $dim-wisdom-tint; border-color: $gh-wisdom-border; }
 .gh-demo-empty { background: $app-surface; border: 1rpx solid $app-border-subtle; border-radius: $uni-radius-lg; padding: 96rpx 40rpx; display: flex; flex-direction: column; align-items: center; }
 .gh-demo-empty-text { font-size: calc(28rpx * var(--font-scale, 1)); color: $facade-text-strong; font-weight: 600; }
-.gh-demo-empty-sub { font-size: calc(24rpx * var(--font-scale, 1)); color: $facade-text-muted; margin-top: 16rpx; }
+.gh-demo-empty-sub { font-size: calc(24rpx * var(--font-scale, 1)); color: $facade-text-slate; margin-top: 16rpx; }
 
 /* 五维健康体系 */
 .gh-wuxing { margin: 0 32rpx 24rpx; background: $app-surface; border: 1rpx solid $app-border-subtle; border-radius: $uni-radius-lg; padding: 32rpx 28rpx; }
@@ -1056,7 +1056,7 @@ $gh-file-bg:      str-slice('#{$dim-body-deep}', 2);
   background-size: 24rpx 24rpx;
   background-image: gh-icon($gh-arrow-bg, '%3Cline x1=%225%22 y1=%2212%22 x2=%2219%22 y2=%2212%22/%3E%3Cpolyline points=%2212 5 19 12 12 19%22/%3E');
 }
-.gh-sep { font-size: calc(20rpx * var(--font-scale, 1)); color: $facade-text-ghost-light; margin: 0 8rpx; }
+.gh-sep { font-size: calc(20rpx * var(--font-scale, 1)); color: $facade-text-slate; margin: 0 8rpx; }
 .gh-rel-hint { display: block; font-size: calc(22rpx * var(--font-scale, 1)); color: $facade-text-body; line-height: 1.65; margin-top: 14rpx; }
 
 /* 五行 rows（首尾身/心 featured 暖底高亮，破五卡等权） */