fix: 隐藏 Demo 标识并修正时间展示

app/templates/index.html

@@ -56,7 +56,7 @@
   <div class="section-heading">
     <div>
       <p class="section-kicker">任务历史</p>
-      <h2>最近任务与 Demo 数据</h2>
+      <h2>最近任务</h2>
     </div>
     {% if has_running_tasks %}<span class="badge text-bg-warning">自动更新中</span>{% endif %}
   </div>

app/templates/partials/task_rows.html

@@ -5,9 +5,6 @@
   <tr>
     <td>
       <span class="task-number">{{ task.display_id or loop.index }}</span>
-      {% if task.is_demo %}
-        <br><span class="badge text-bg-info">Demo 数据</span>
-      {% endif %}
     </td>
     <td>{{ task.platform | platform_label }}</td>
     <td>{{ task.created_at_label }}</td>

app/templates/tasks/detail.html

@@ -20,7 +20,7 @@
   {% set ai_percent = rate_percent(task.analysis_success_rate) %}
   {% set target_comments = task.hotspot_limit * task.item_limit_per_hotspot * task.comment_limit_per_item %}
   <div class="d-flex flex-wrap justify-content-between gap-3 mb-3">
-    <p class="mb-0">平台：{{ task.platform | platform_label }}{% if task.is_demo %}<span class="badge text-bg-info ms-2">Demo 数据</span>{% endif %}</p>
+    <p class="mb-0">平台：{{ task.platform | platform_label }}</p>
     <p class="mb-0 text-muted">创建时间 {{ task.created_at_label }} · 阶段 {{ task.current_stage_label or "等待启动" }}</p>
   </div>
   <div class="mb-3">