Remove PostgreSQL support and standardize on SQLite only.

Co-authored-by: Cursor <cursoragent@cursor.com>

modules/web/templates/settings.html

@@ -575,18 +575,17 @@
             {{ restore_status.message }}
         {% endif %}
     </div>
-    <p class="hint" style="margin:.5rem 0 0">备份含 <code>futures.db</code> / <code>postgres_dump.sql</code>、<code>uploads/</code>、<code>.env</code>。网页恢复目标：<code>{{ backup_restore_dir }}</code>。</p>
+    <p class="hint" style="margin:.5rem 0 0">备份含 <code>futures.db</code>、<code>uploads/</code>、<code>.env</code>。网页恢复目标：<code>{{ backup_restore_dir }}</code>。</p>
 
     {% if backup_items %}
     <table class="settings-backup-table" id="backup-items-table">
         <thead>
-            <tr><th>文件名</th><th>类型</th><th>.env</th><th>大小</th><th>时间</th><th>操作</th></tr>
+            <tr><th>文件名</th><th>.env</th><th>大小</th><th>时间</th><th>操作</th></tr>
         </thead>
         <tbody>
             {% for item in backup_items %}
             <tr data-backup-name="{{ item.name }}">
                 <td><code>{{ item.name }}</code></td>
-                <td>{{ item.backend_label or '—' }}</td>
                 <td>{% if item.includes_env %}有{% else %}—{% endif %}</td>
                 <td>{{ item.size_mb }} MB</td>
                 <td>{{ (item.created_at or item.mtime).replace('T', ' ')[:16] }}</td>
@@ -606,8 +605,7 @@
         <summary>备份恢复说明</summary>
         <ol style="margin:.5rem 0 0 1rem;padding:0">
             <li>可在上方上传 <code>.tar.gz</code>，或从列表下载备份到本机。</li>
-            <li>点击「恢复此备份」会停止服务、还原数据库 / <code>uploads/</code> / <code>.env</code>，然后自动重启。</li>
-            <li>恢复前请确认备份类型与当前服务一致（SQLite / PostgreSQL）。</li>
+            <li>点击「恢复此备份」会停止服务、还原 <code>futures.db</code>、<code>uploads/</code> 与 <code>.env</code>，然后自动重启。</li>
             <li>也可在服务器手工执行包内 <code>restore.sh</code>（见 <code>RESTORE_DIR</code>）。</li>
         </ol>
     </details>