feat: run ServiceInstaller so gui plugins install over the bus

[JarbasAl]

🤖 Auto-generated by Claude Opus 4.8 (claude-opus-4-8) via Claude Code — NOT human-reviewed. Verify before acting.

What

Run ovos_utils.skill_installer.ServiceInstaller inside GUIService so ovos-gui installs gui plugins into its own environment over the message bus. It answers the broadcast ovos.pip.install / .uninstall and the targeted ovos.pip.install.ovos_gui / .uninstall.ovos_gui, replying on the base ovos.pip.install.complete / .failed topics.

Why

In a split or containerised deployment each service owns a separate venv. A gui plugin must install into the process that loads it — the gui service. This is one of a fleet of companion PRs (audio, listener, PHAL, core) giving every service its own installer; ovos-webui's plugin browser routes each plugin family to the owning service by these topics.

service_name convention

service_name="ovos_gui" — the module/process name with underscores, following ServiceInstaller's own documented convention (its docstring lists ovos_audio, ovos_gui, ovos_core, ovos_messagebus). The web-ui routing map and every companion PR use this same form.

Safety

Gated by the existing skills.installer.allow_pip config — off by default. Cleanly unregistered on shutdown.

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✅ All versions pass

Python	Build	Install
3.10	✅	✅
3.11	✅	✅
3.12	✅	✅
3.13	✅	✅
3.14	✅	✅

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