fix(aihr): hide demo records during initial load

frontend/src/views/knowledge/cases.vue

@@ -118,7 +118,7 @@
         <el-icon><Tickets /></el-icon>
         <h2>最近案例</h2>
       </div>
-      <el-table :data="records" size="small" class="record-table">
+      <el-table v-loading="recordsLoading" :data="records" size="small" class="record-table">
         <el-table-column prop="title" label="标题" min-width="180" />
         <el-table-column prop="type" label="类型" width="120" />
         <el-table-column prop="status" label="状态" width="120" />
@@ -188,7 +188,7 @@ const apiSummary = ref<CaseSummaryItem[]>([]);
 const apiTags = ref<CaseTag[]>([]);
 const apiRecord = ref<CaseRecord | null>(null);
 const apiSampleHint = ref('');
-const recordsLoading = ref(false);
+const recordsLoading = ref(true);
 const recordsFallback = ref(false);
 const detailVisible = ref(false);
 const caseDetail = ref<CaseDetailResponse | null>(null);
@@ -279,7 +279,7 @@ const baseRecords = [
   }
 ];
 
-const records = ref([...baseRecords]);
+const records = ref<CaseRecord[]>([]);
 
 async function loadCaseRecords() {
   recordsLoading.value = true;