refactor: 全项目 UI/UX 标准化修复

- P0: uni.scss 全局 Token 修正（字体SourceHanSerifCN、色彩#111/#333/#666/#999/#eeeeee、删除600字重）
- P0: 分包6页面色彩迁移（#4A90D9→#3c9cff、#E74C3C→#e53935、圆角统一24rpx）
- P1: qrcode页面全量SCSS迁移（12个硬编码色值替换、emoji图标替换、圆角统一）
- P1: index页面价格色修正（#f9ae3d→#e53935、按钮主色统一、硬编码字号对齐）
- P2: 10个页面字号/圆角/字体统一（notice-list/scenic/login/profile/faq/card-bind等）
- P3: 全局 font-weight:600 替换为500/700（5处），删除semibold变量和工具类
- 新增 -size-title: 38rpx Token
- 构建验证通过

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

src/pages/index/index.vue

@@ -272,9 +272,9 @@ function goMore() {
   flex-shrink: 0;
   background: $color-accent;
 
-  &.type-important { background: #EF4444; }
-  &.type-scenic { background: #0052FF; }
-  &.type-promo { background: #F59E0B; }
+  &.type-important { background: #e53935; }
+  &.type-scenic { background: #3c9cff; }
+  &.type-promo { background: #f9ae3d; }
 }
 
 .chevron {
@@ -311,7 +311,7 @@ function goMore() {
   background: $color-card;
   padding: $spacing-2 $spacing-3;
   margin: $spacing-2 $spacing-3 0;
-  border-radius: 16rpx;
+  border-radius: 24rpx;
   box-shadow: $shadow-sm;
 }
 
@@ -374,7 +374,7 @@ function goMore() {
   margin: $spacing-3;
   padding: $spacing-3 0;
   background: $color-card;
-  border-radius: 16rpx;
+  border-radius: 24rpx;
   box-shadow: $shadow-sm;
 }
 
@@ -411,7 +411,7 @@ function goMore() {
 
 .promo {
   position: relative;
-  border-radius: $radius-xl;
+  border-radius: $radius-lg;
   overflow: hidden;
   min-height: 400rpx;
   transition: transform $transition-fast;
@@ -460,13 +460,13 @@ function goMore() {
   padding: 6rpx $spacing-3;
   font-size: $font-size-sm;
   color: rgba(255, 255, 255, 0.95);
-  font-weight: $font-weight-semibold;
+  font-weight: 500;
   margin-bottom: $spacing-3;
 }
 
 .promo-name {
   font-family: $font-family-display;
-  font-size: 56rpx;
+  font-size: 38rpx;
   font-weight: $font-weight-bold;
   color: #fff;
   display: block;
@@ -490,13 +490,13 @@ function goMore() {
 .promo-currency {
   font-size: $font-size-2xl;
   font-weight: $font-weight-bold;
-  color: $uv-warning;
+  color: #e53935;
 }
 
 .promo-price {
-  font-size: 96rpx;
+  font-size: 48rpx;
   font-weight: $font-weight-bold;
-  color: $uv-warning;
+  color: #e53935;
   line-height: 0.85;
   letter-spacing: -4rpx;
 }
@@ -516,7 +516,7 @@ function goMore() {
 
 .promo-save {
   font-size: $font-size-2xl;
-  color: $uv-warning;
+  color: #e53935;
   font-weight: $font-weight-bold;
   letter-spacing: 2rpx;
 }
@@ -552,8 +552,8 @@ function goMore() {
   align-self: flex-start;
   padding: $spacing-2 $spacing-8;
   border-radius: $radius-full;
-  background: $uv-warning;
-  box-shadow: 0 8rpx 24rpx rgba(249, 174, 61, 0.4);
+  background: $uv-primary;
+  box-shadow: 0 8rpx 24rpx rgba(60, 156, 255, 0.3);
   transition: transform $transition-fast;
 
   &:active {
@@ -563,14 +563,14 @@ function goMore() {
   .cta-label {
     font-size: $font-size-base;
     font-weight: $font-weight-bold;
-    color: $uv-main-color;
+    color: #ffffff;
   }
 
   .cta-arrow {
     width: 10rpx;
     height: 10rpx;
-    border-top: 3rpx solid $uv-main-color;
-    border-right: 3rpx solid $uv-main-color;
+    border-top: 3rpx solid #ffffff;
+    border-right: 3rpx solid #ffffff;
     transform: rotate(45deg);
   }
 }
@@ -676,7 +676,7 @@ function goMore() {
 
 .spot-name {
   font-size: $font-size-sm;
-  font-weight: $font-weight-semibold;
+  font-weight: 500;
   color: $color-foreground;
   display: block;
   margin-bottom: $spacing-1;
@@ -693,8 +693,8 @@ function goMore() {
 
 .spot-price {
   font-size: $font-size-base;
-  color: $uv-warning;
-  font-weight: $font-weight-semibold;
+  color: #e53935;
+  font-weight: 500;
 }
 
 .spot-benefit {