feat: AI余额定时自动同步（CLI脚本+systemd每日timer+批量同步接口+前端按钮）

deploy/vps-sync-ai.service

@@ -0,0 +1,13 @@
+# AI 账号余额同步服务（oneshot，由 timer 触发）
+# 部署位置：/etc/systemd/system/vps-sync-ai.service
+
+[Unit]
+Description=Sync all AI account balances
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+WorkingDirectory=/opt/vps-manager
+EnvironmentFile=-/opt/vps-manager/.env
+ExecStart=/opt/vps-manager/.venv/bin/python /opt/vps-manager/scripts/sync_ai_balances.py

deploy/vps-sync-ai.timer

@@ -0,0 +1,13 @@
+# AI 账号余额每日同步定时器
+# 部署位置：/etc/systemd/system/vps-sync-ai.timer
+
+[Unit]
+Description=Daily sync of AI account balances
+
+[Timer]
+OnCalendar=daily
+Persistent=true
+Unit=vps-sync-ai.service
+
+[Install]
+WantedBy=timers.target