fix(ui): 批量替换所有组件中残留的硬编码深色值以彻底支持浅色主题

app/components/UserTutorial.vue

@@ -359,15 +359,15 @@ onMounted(() => {
   z-index: 9999;
   border-radius: 8px;
   box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5), 0 0 15px rgba(0, 0, 0, 0.5);
-  border: 2px solid #3b82f6;
+  border: 2px solid var(--border-secondary, #3b82f6);
   pointer-events: none;
   transition: all 0.4s ease;
   background: transparent;
 }
 
 .tour-popover {
-  background: #18181b;
-  border: 1px solid #27272a;
+  background: var(--bg-secondary, #18181b);
+  border: 1px solid var(--border-secondary, #27272a);
   border-radius: 12px;
   padding: 1.25rem;
   width: 320px;
@@ -440,9 +440,9 @@ onMounted(() => {
 }
 
 .tour-btn-secondary {
-  background: #27272a;
+  background: var(--bg-tertiary, #27272a);
   color: #d4d4d8;
-  border: 1px solid #3f3f46;
+  border: 1px solid var(--border-secondary, #3f3f46);
 }
 
 .tour-btn-secondary:hover {
@@ -456,6 +456,6 @@ onMounted(() => {
 }
 
 .tour-btn-primary:hover {
-  background: #2563eb;
+  background: var(--bg-tertiary, #2563eb);
 }
 </style>