UI/UX优化: CSS变量化 + 错误反馈增强 + 按钮type属性

- CSS: 全部硬编码hex颜色替换为CSS变量(base/scan/pages/responsive/admin)
- CSS: 硬编码字体提取为--font-sans/--font-mono变量
- CSS: 新增打印色/渐变色/辅助色等20+变量定义
- CSS: 修复scan.css lint警告(line-clamp标准属性+空规则集)
- app.js: 16处用户可感知catch块补充showToast错误反馈
- app.js: 全部console.log降级为console.debug
- index.html: 76个button补充type属性
- index.html: 内联hex颜色/SVG stroke/Vue :style替换为CSS变量
- admin.html: 残留hex替换为CSS变量
- 全部CSS版本号更新用于缓存刷新

stock-html/static/css/responsive.css

@@ -369,17 +369,17 @@
     /* 涨跌色保持可区分（改为深色） */
     .deep-change.up, .batch-change.up, .alert-change.up,
     .positive, .trade-profit.profit, .holding-profit.profit {
-        color: #c0392b !important;
+        color: var(--print-up) !important;
     }
     .deep-change.down, .batch-change.down, .alert-change.down,
     .negative, .trade-profit.loss, .holding-profit.loss {
-        color: #27ae60 !important;
+        color: var(--print-down) !important;
     }
 
     /* 评分圆环保持色差 */
-    .deep-score-circle.score-high { background: #c0392b !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
-    .deep-score-circle.score-mid { background: #e67e22 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
-    .deep-score-circle.score-low { background: #7f8c8d !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
+    .deep-score-circle.score-high { background: var(--print-up) !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
+    .deep-score-circle.score-mid { background: var(--print-mid) !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
+    .deep-score-circle.score-low { background: var(--print-low) !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
     .score-num { color: #fff !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
 
     /* SVG 保色 */