feat(deploy): openclaw-01 生产部署脚本、systemd 单元与部署文档

deploy/prod/dadaotask-api.service

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+# 达道Task 生产服务（用户级 systemd，openclaw-01 上不需要 root）
+#
+# 安装：
+#   cp deploy/prod/dadaotask-api.service ~/.config/systemd/user/
+#   systemctl --user daemon-reload
+#   systemctl --user enable --now dadaotask-api
+#
+# 两份 EnvironmentFile：
+#   env.production —— 真实配置与口令（chmod 600，不进仓库）
+#   env.build      —— 由 deploy.sh 每次部署重写（BUILD_COMMIT / BUILD_TIME），供 /version 校验
+[Unit]
+Description=DadaoTask API (prod, gunicorn + uvicorn workers)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+WorkingDirectory=/home/openclaw/app/dadaotask/backend
+EnvironmentFile=/home/openclaw/.config/dadaotask/env.production
+EnvironmentFile=/home/openclaw/.config/dadaotask/env.build
+Environment=PYTHONUNBUFFERED=1
+ExecStart=/home/openclaw/app/dadaotask/.venv/bin/gunicorn app.main:app \
+    -k uvicorn.workers.UvicornWorker -w 2 \
+    -b 0.0.0.0:8200 \
+    --timeout 60 --graceful-timeout 30 --keep-alive 5 \
+    --access-logfile - --error-logfile -
+Restart=always
+RestartSec=3
+KillSignal=SIGTERM
+TimeoutStopSec=40
+
+[Install]
+WantedBy=default.target