**Motivations:**
- Manage ia-dev-gateway, tools-bridge and orchestrator as user services.
- Provide a repeatable install path aligned with existing systemd patterns.
**Root causes:**
- N/A
**Correctifs:**
- N/A
**Evolutions:**
- Add systemd user unit templates for ia-dev-gateway, smart-ide-tools-bridge and smart-ide-orchestrator.
- Add an install script and document it in docs/repo/systemd-units.md.
**Pages affectées:**
- N/A
