fix(ui): 主题与脑图浅色适配、标签配色及静态资源缓存

- 浅色模式下用例脑图区域改为浅色样式
- 恢复 el-tag 按 success/warning/info 等类型的颜色
- 启动时应用主题，Home 内容区深色样式兜底
- nginx 禁止缓存 index.html，hash 静态资源长期缓存

Co-authored-by: Cursor <cursoragent@cursor.com>

src/App.vue

@@ -233,12 +233,36 @@ button,
   border-color: rgba(56, 189, 248, 0.5);
 }
 
-.el-tag {
+.el-tag:not(.el-tag--success):not(.el-tag--warning):not(.el-tag--danger):not(.el-tag--info) {
   border-color: rgba(56, 189, 248, 0.28);
   background: rgba(56, 189, 248, 0.12);
   color: #bae6fd;
 }
 
+.el-tag.el-tag--success {
+  border-color: rgba(103, 194, 58, 0.45);
+  background: rgba(103, 194, 58, 0.16);
+  color: #86efac;
+}
+
+.el-tag.el-tag--warning {
+  border-color: rgba(230, 162, 60, 0.45);
+  background: rgba(230, 162, 60, 0.16);
+  color: #fcd34d;
+}
+
+.el-tag.el-tag--danger {
+  border-color: rgba(245, 108, 108, 0.45);
+  background: rgba(245, 108, 108, 0.16);
+  color: #fca5a5;
+}
+
+.el-tag.el-tag--info {
+  border-color: rgba(148, 163, 184, 0.35);
+  background: rgba(148, 163, 184, 0.14);
+  color: #cbd5e1;
+}
+
 .el-card__header {
   background: #162033;
   border-bottom-color: rgba(148, 163, 184, 0.18);
@@ -439,12 +463,36 @@ body.theme-light .el-tabs__nav-wrap::after {
   background-color: #e2e8f0;
 }
 
-body.theme-light .el-tag {
+body.theme-light .el-tag:not(.el-tag--success):not(.el-tag--warning):not(.el-tag--danger):not(.el-tag--info) {
   border-color: #bfdbfe;
   background: #eff6ff;
   color: #1d4ed8;
 }
 
+body.theme-light .el-tag.el-tag--success {
+  border-color: #e1f3d8;
+  background: #f0f9eb;
+  color: #67c23a;
+}
+
+body.theme-light .el-tag.el-tag--warning {
+  border-color: #faecd8;
+  background: #fdf6ec;
+  color: #e6a23c;
+}
+
+body.theme-light .el-tag.el-tag--danger {
+  border-color: #fde2e2;
+  background: #fef0f0;
+  color: #f56c6c;
+}
+
+body.theme-light .el-tag.el-tag--info {
+  border-color: #e9e9eb;
+  background: #f4f4f5;
+  color: #909399;
+}
+
 body.theme-light .el-tree,
 body.theme-light .el-tree-node__content {
   color: #334155;