feat: 清理示例数据并统一空态体验

frontend/src/components/StateEmpty.vue

@@ -1,8 +1,8 @@
 <template>
   <section class="ctms-state state state-empty">
-    <el-icon class="ctms-state-icon state-icon"><Document /></el-icon>
-    <h3 class="ctms-state-title state-title">{{ title }}</h3>
-    <p v-if="description" class="ctms-state-desc state-desc">{{ description }}</p>
+    <el-icon v-if="false" class="ctms-state-icon state-icon"><Document /></el-icon>
+    <h3 v-if="!description" class="ctms-state-title state-title">{{ title }}</h3>
+    <p class="ctms-state-desc state-desc">{{ description || title }}</p>
     <div v-if="$slots.action" class="ctms-state-action state-action">
       <slot name="action" />
     </div>
@@ -26,15 +26,33 @@ withDefaults(
 </script>
 
 <style scoped>
+.state-empty {
+  padding: 28px 12px;
+  gap: 8px;
+}
+
 .state-icon {
   color: var(--ctms-text-disabled);
+  font-size: 18px;
+  opacity: 0.35;
 }
 
 .state-title {
-  color: var(--ctms-text-regular);
+  color: var(--ctms-text-secondary);
+  font-size: 14px;
+  font-weight: 600;
+  line-height: 1.4;
+  margin: 0;
 }
 
 .state-desc {
-  color: var(--ctms-text-secondary);
+  color: #8a97ab;
+  font-size: 14px;
+  line-height: 1.6;
+  margin: 0;
+}
+
+.state-action {
+  margin-top: 4px;
 }
 </style>