feat(commentary): 双 provider 评论 — Angel(Agnes) + 美团大模型(LongCat)

- 新增 articles.commentary_meituan{_status,_model,_error} 4 列 + commentary_engine
- LlmSetting 加 meituan_api_key/base_url/chat_model/interval_sec/enabled/commentary_prompt
- 新 app/services/llm/providers.py 工厂,支持多 provider 客户端
- enrichment 流程改为 commentary_angel + commentary_meituan 并行(asyncio.gather),
  任一 provider 失败不影响另一个
- enrichment_loop 状态判定:任一 provider 状态不是 ok 都视为待 enrich
- alembic 0004_dual_commentary 迁移
- 前端 Feed 卡片 + ArticleDetail 详情页各加一条'美团评论'卡
- AdminLlmSettings 加美团 provider 配置卡(独立 api_key 编辑器,不回显明文)
- LlmSettingOut.meituan_api_key_set (bool) 替代直接回传 key
- 默认 URL https://api.longcat.chat/openai/v1 / 默认模型 LongCat-2.0-Preview

frontend/src/views/Feed.vue

@@ -224,20 +224,36 @@ onMounted(async () => {
               {{ bodyExcerpt(a.body_zh_text || a.summary_zh, 220) }}
             </div>
 
-            <!-- 评论钩子(淡木色背景 + 木色左边框,与 Android 对齐) -->
+            <!-- 评论钩子(双 provider:Angel + 美团,淡木色背景 + 木色左边框,与 Android 对齐) -->
             <div
-              v-if="a.commentary"
+              v-if="a.commentary || a.commentary_meituan"
               class="commentary-box"
             >
-              <NSpace align="center" :size="6" style="margin-bottom: 6px">
-                <span class="commentary-label">💬 评论</span>
-                <NTag size="tiny" :type="commentaryStatusType(a.commentary_status)" round :bordered="false">
-                  {{ a.commentary_status || 'n/a' }}
-                </NTag>
-              </NSpace>
-              <div class="commentary-text">
-                {{ previewCommentary(a.commentary, 140) }}
-              </div>
+              <!-- Angel 评论 -->
+              <template v-if="a.commentary">
+                <NSpace align="center" :size="6" style="margin-bottom: 6px">
+                  <span class="commentary-label">💬 Angel 评论</span>
+                  <NTag size="tiny" :type="commentaryStatusType(a.commentary_status)" round :bordered="false">
+                    {{ a.commentary_status || 'n/a' }}
+                  </NTag>
+                </NSpace>
+                <div class="commentary-text">
+                  {{ previewCommentary(a.commentary, 140) }}
+                </div>
+              </template>
+              <!-- 美团评论 -->
+              <template v-if="a.commentary_meituan">
+                <div v-if="a.commentary" class="commentary-divider" />
+                <NSpace align="center" :size="6" style="margin-bottom: 6px">
+                  <span class="commentary-label commentary-label-meituan">🐱 美团评论</span>
+                  <NTag size="tiny" :type="commentaryStatusType(a.commentary_meituan_status)" round :bordered="false">
+                    {{ a.commentary_meituan_status || 'n/a' }}
+                  </NTag>
+                </NSpace>
+                <div class="commentary-text">
+                  {{ previewCommentary(a.commentary_meituan, 140) }}
+                </div>
+              </template>
             </div>
           </NSpace>
         </NCard>
@@ -277,12 +293,23 @@ onMounted(async () => {
   color: var(--color-primary);
 }
 
+.commentary-label-meituan {
+  color: #c2410c;  /* 橙色,与 Angel 区分 */
+}
+
 .commentary-text {
   color: var(--color-letter);
   font-size: 13px;
   line-height: 1.7;
 }
 
+.commentary-divider {
+  height: 1px;
+  background: var(--color-primary-soft);
+  margin: 10px 0;
+  opacity: 0.6;
+}
+
 /* ===== 桌面端默认宽度 ===== */
 .feed-source-select {
   min-width: 240px;