feat: add participant data persistence display and mobile responsive fixes

- Add getStats() method to participantService for tag distribution
- Update participants API to return tagDistribution statistics
- Load existing participants on AdminControl mount
- Add mobile responsive styles for import section

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/client-screen/src/views/AdminControl.vue

@@ -128,6 +128,25 @@ const tagLabels: Record<string, string> = {
   'horse': '属马',
 };
 
+// Load existing participants from server
+async function loadParticipants() {
+  try {
+    const response = await fetch('/api/admin/participants');
+    const data = await response.json();
+    if (data.success && data.data?.count > 0) {
+      importResult.value = {
+        success: true,
+        totalCount: data.data.count,
+        importedCount: data.data.count,
+        tagDistribution: data.data.tagDistribution || {},
+        errors: [],
+      };
+    }
+  } catch (error) {
+    console.error('Failed to load participants:', error);
+  }
+}
+
 // Navigation
 function goBack() {
   router.push('/');
@@ -348,6 +367,8 @@ onMounted(() => {
   admin.connect();
   // 加载服务器奖项配置
   loadPrizeConfig();
+  // 加载已导入的参与者数据
+  loadParticipants();
 });
 </script>
 
@@ -1701,6 +1722,45 @@ $admin-danger: #ef4444;
   }
 }
 
+// Import Section Mobile Styles
+@media (max-width: 768px) {
+  .import-section {
+    grid-column: span 1;
+  }
+
+  .import-controls {
+    flex-direction: column;
+    align-items: stretch;
+    gap: 12px;
+  }
+
+  .file-input-wrapper {
+    width: 100%;
+
+    .file-input-label {
+      width: 100%;
+      text-align: center;
+      box-sizing: border-box;
+    }
+  }
+
+  .result-stats {
+    gap: 12px;
+
+    .stat-item {
+      min-width: calc(33% - 8px);
+
+      .stat-value {
+        font-size: 18px;
+      }
+    }
+  }
+
+  .import-result {
+    padding: 12px;
+  }
+}
+
 // Prize Config Button & Modal
 .prize-config-btn {
   margin-top: 12px;

packages/server/src/routes/admin.routes.ts

@@ -137,15 +137,17 @@ router.post('/participants/import', upload.single('file'), async (req, res, next
 
 /**
  * GET /api/admin/participants
- * Get all participants
+ * Get all participants with statistics
  */
 router.get('/participants', async (_req, res, next) => {
   try {
     const participants = participantService.getAll();
+    const stats = participantService.getStats();
     return res.json({
       success: true,
       data: {
         count: participants.length,
+        tagDistribution: stats.tagDistribution,
         participants,
       },
     });

packages/server/src/services/participant.service.ts

@@ -232,6 +232,22 @@ class ParticipantService {
         return this.participants.size;
     }
 
+    /**
+     * Get statistics including tag distribution
+     */
+    getStats(): { count: number; tagDistribution: Record<string, number> } {
+        const tagDistribution: Record<string, number> = {};
+        for (const p of this.participants.values()) {
+            for (const tag of p.tags) {
+                tagDistribution[tag] = (tagDistribution[tag] || 0) + 1;
+            }
+        }
+        return {
+            count: this.participants.size,
+            tagDistribution,
+        };
+    }
+
     /**
      * Save participants to Redis for persistence
      */