feat(dashboard): rich data display to overview system states

- add tunnel, mcp configurations insights
- show more statistical cards
- add create backup quick action

src/style/pages.css

@@ -6,6 +6,59 @@
   margin-bottom: var(--space-xl);
 }
 
+.dashboard-overview {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: var(--space-xl);
+  margin-bottom: var(--space-xl);
+}
+
+.overview-section {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-md);
+}
+
+.overview-item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--space-md) var(--space-lg);
+  background: var(--bg-card);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-lg);
+  transition: all var(--transition-fast);
+}
+
+.overview-item:hover {
+  background: var(--bg-card-hover);
+  border-color: var(--border-focus);
+}
+
+.overview-label {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  font-size: var(--font-size-sm);
+  color: var(--text-secondary);
+  font-weight: 500;
+}
+
+.overview-label svg {
+  width: 16px;
+  height: 16px;
+  color: var(--text-tertiary);
+}
+
+.overview-value {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  font-size: var(--font-size-sm);
+  font-family: var(--font-mono);
+  color: var(--text-primary);
+}
+
 /* 服务卡片 */
 .service-card {
   display: flex;