feat: 系统设置增加备份恢复与默认登录 admin

支持手动/每日自动备份四所数据库、K线库与 env，上传 zip 一键恢复；中控默认账号 admin/admin123。

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

manual_trading_hub/static/app.css

@@ -2904,6 +2904,88 @@ button.btn-sm {
   line-height: 1.45;
 }
 
+.backup-settings-grid {
+  margin-top: 12px;
+}
+
+.backup-actions {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 12px;
+  margin-top: 16px;
+}
+
+.backup-status-line {
+  font-size: 0.82rem;
+  color: var(--muted);
+}
+
+.backup-status-line.err {
+  color: var(--danger, #f87171);
+}
+
+.backup-restore-upload {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: flex-end;
+  gap: 12px;
+  margin-top: 16px;
+  padding-top: 16px;
+  border-top: 1px solid var(--border);
+}
+
+.backup-upload-label {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  font-size: 0.82rem;
+  color: var(--muted);
+}
+
+.backup-list {
+  margin-top: 16px;
+}
+
+.backup-meta {
+  font-size: 0.78rem;
+  color: var(--muted);
+  line-height: 1.5;
+  margin-bottom: 10px;
+}
+
+.backup-meta code {
+  font-size: 0.76rem;
+}
+
+.backup-empty {
+  font-size: 0.82rem;
+  color: var(--muted);
+}
+
+.backup-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.82rem;
+}
+
+.backup-table th,
+.backup-table td {
+  padding: 8px 10px;
+  border-bottom: 1px solid var(--border);
+  text-align: left;
+}
+
+.backup-row-actions {
+  white-space: nowrap;
+}
+
+.backup-row-actions .ghost,
+.backup-row-actions .danger {
+  font-size: 0.78rem;
+  padding: 4px 8px;
+}
+
 .settings-card {
   background: var(--panel);
   border: 1px solid var(--border);