feat: enhance prompt selector with category tags and improve benchmark task processing

Add visual indicators for prompt categories and source types in the prompt selector component, and refactor benchmark task execution to use Dify streaming analysis with proper error handling and text extraction from Alibaba Cloud transcription results.

frontend/app/web-gold/src/components/PromptSelector.vue

@@ -15,7 +15,13 @@
           :value="prompt.id"
         >
           <div class="prompt-option">
-            <span class="prompt-option-name">{{ prompt.name }}</span>
+            <div class="prompt-option-left">
+              <span class="prompt-option-name">{{ prompt.name }}</span>
+              <span v-if="prompt.category" class="prompt-option-tag category">{{ prompt.category }}</span>
+            </div>
+            <span class="prompt-option-tag" :class="prompt.source === 'created' ? 'created' : 'favorite'">
+              {{ prompt.source === 'created' ? '自建' : '收藏' }}
+            </span>
           </div>
         </a-select-option>
       </a-select>
@@ -313,6 +319,37 @@ onMounted(() => {
   font-weight: 500;
 }
 
+.prompt-option-left {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex: 1;
+  min-width: 0;
+}
+
+.prompt-option-tag {
+  font-size: 12px;
+  padding: 2px 8px;
+  border-radius: 10px;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.prompt-option-tag.category {
+  background: rgba(24, 144, 255, 0.1);
+  color: var(--color-primary);
+}
+
+.prompt-option-tag.created {
+  background: rgba(16, 185, 129, 0.1);
+  color: #10b981;
+}
+
+.prompt-option-tag.favorite {
+  background: rgba(245, 158, 11, 0.1);
+  color: #f59e0b;
+}
+
 /* 标签模式 */
 .prompt-tags-container {
   margin-bottom: 12px;