docs(server): add systemd user-service setup for openviking-server

[Gujiassh]

Summary

• add a user-level systemd service example for openviking-server
• document the quickstart flow for enabling and running it without a root-managed unit

Validation

• docs-only change

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⚡ Recommended focus areas for review Documentation Consistency PR updates only English documentation; Chinese and Japanese translations are missing for the new systemd user service section. ## Run with systemd user service (recommended for Linux) `openviking-server` runs in the foreground. For persistent Linux sessions, use a user-level systemd unit instead of shell background wrappers. 1. Copy the example unit file: ```bash mkdir -p ~/.config/systemd/user cp docs/en/getting-started/examples/openviking-server.service ~/.config/systemd/user/openviking.service Edit the unit values: Set WorkingDirectory to your OpenViking workspace Set Environment=OPENVIKING_CONFIG_FILE=... to your ov.conf path Optionally add Environment=OPENVIKING_CLI_CONFIG_FILE=... if needed Enable and start: systemctl --user daemon-reload systemctl --user enable --now openviking.service systemctl --user status openviking.service View logs: journalctl --user -u openviking.service -f </details> </td></tr> </table>

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