feat(serve): run taosmd serve as a persistent background service (systemd/launchd/Windows)

[jaylfc]

Lets users run the local memory HTTP API / dashboard as an always-on background service, so the live (SSE-backed) inspector is persistently available without manually launching taosmd serve.

What

• New taosmd serve flags (mutually exclusive): --install-service, --uninstall-service, --service-status. They install/manage a service that runs taosmd serve with the same --host/--port/--data-dir you pass, then exit (no foreground server).
• New module taosmd/service_install.py with pure rendering functions + platform dispatch (sys.platform):
  • Linux — systemd user unit at ~/.config/systemd/user/taosmd.service (Restart=on-failure, RestartSec=5), then systemctl --user daemon-reload + enable --now.
  • macOS — launchd LaunchAgent at ~/Library/LaunchAgents/com.taosmd.serve.plist (RunAtLoad, KeepAlive, logs under ~/Library/Logs/taosmd/), loaded via launchctl.
  • Windows — ships scripts/install-service.ps1 (Scheduled Task at logon, -Uninstall switch); the CLI prints clear instructions pointing to it rather than attempting install from Python.
• docs/serve-service.md — per-platform install/uninstall/status, log locations, how to change host/port/data-dir, and the localhost-vs-LAN/no-auth security note.

Notes

• Additive — foreground taosmd serve and all defaults unchanged. stdlib only, no new deps. subprocess called with explicit arg lists (never shell=True); graceful handling when systemctl/launchctl are absent.
• 392 tests pass (338 prior + 54 new in tests/test_service_install.py, all hermetic — rendering tested as pure functions, writes under tmp_path, no real ~/.config/~/Library touched).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a7564753-2322-492e-8b09-5d0ca84f4e8d

📥 Commits

Reviewing files that changed from the base of the PR and between 3ab495f and 121423f.

📒 Files selected for processing (6)

• README.md
• docs/serve-service.md
• scripts/install-service.ps1
• taosmd/cli.py
• taosmd/service_install.py
• tests/test_service_install.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/serve-service

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