fix(frontend): remove fake case sample action

frontend/src/views/knowledge/cases.vue

@@ -68,14 +68,9 @@
             <small>{{ step.note }}</small>
           </div>
         </div>
-        <div class="sample-card" :class="{ active: sampleVisible }">
+        <div class="sample-card" :class="{ active: stored }">
           <strong>视频样片</strong>
-          <p>
-            {{
-              sampleVisible ? '已命中车库积水投诉处理样片，可用于演示案例沉淀后的培训复用。' : '案例转视频本期只展示预渲染样片，不现场调用视频生成。'
-            }}
-          </p>
-          <el-button :icon="VideoCamera" @click="viewSample">查看样片</el-button>
+          <p>{{ apiSampleHint || '案例转视频本期不现场调用视频生成；当前只展示案例入库结果。' }}</p>
         </div>
       </article>
     </section>
@@ -98,7 +93,7 @@
 </template>
 
 <script setup name="KnowledgeCases" lang="ts">
-import { DocumentChecked, FolderChecked, Microphone, Tickets, VideoCamera } from '@element-plus/icons-vue';
+import { DocumentChecked, FolderChecked, Microphone, Tickets } from '@element-plus/icons-vue';
 import { ElMessage } from 'element-plus';
 import { computed, ref } from 'vue';
 import { useRouter } from 'vue-router';
@@ -111,7 +106,6 @@ const audioUploaded = ref(false);
 const organized = ref(false);
 const reviewed = ref(false);
 const stored = ref(false);
-const sampleVisible = ref(false);
 const caseId = ref('');
 const apiMode = ref<'idle' | 'api' | 'error'>('idle');
 const apiFileName = ref('');
@@ -168,9 +162,9 @@ const pipeline = computed(() => [
   },
   {
     name: '样片展示',
-    count: sampleVisible.value ? '1 条' : '5 条',
-    note: sampleVisible.value ? '已打开预渲染样片' : '演示兜底',
-    state: sampleVisible.value ? 'done' : 'todo'
+    count: '0 条',
+    note: apiSampleHint.value || '未接视频样片',
+    state: 'todo'
   }
 ]);
 
@@ -216,7 +210,6 @@ async function uploadAudio(file: File) {
   organized.value = false;
   reviewed.value = false;
   stored.value = false;
-  sampleVisible.value = false;
   apiSummary.value = [];
   apiRecord.value = null;
   apiSampleHint.value = '';
@@ -296,11 +289,6 @@ async function storeCase() {
     ElMessage.error('后端案例入库 API 不可用');
   }
 }
-
-function viewSample() {
-  sampleVisible.value = true;
-  ElMessage.info(apiSampleHint.value || '已打开预渲染样片兜底');
-}
 </script>
 
 <style lang="scss" scoped>