feat(market): 技能/MCP 分类改为面向用户的业务场景(人群->场景)，AI验证期按场景归类

frontend/src/pages/front/MarketPage.css

@@ -1744,10 +1744,26 @@
 .capability-filter {
   display: flex;
   flex-wrap: wrap;
+  align-items: center;
   gap: var(--space-xs);
   padding: var(--space-sm) 0 0;
 }
 
+.cap-group-label {
+  display: inline-flex;
+  align-items: center;
+  margin-left: var(--space-sm);
+  padding: 0 4px;
+  font-size: 11px;
+  font-weight: 700;
+  color: var(--color-text-tertiary);
+  letter-spacing: 0.02em;
+}
+
+.cap-group-label:first-of-type {
+  margin-left: 0;
+}
+
 .cap-chip {
   padding: 4px 12px;
   font-size: var(--text-xs);