Use repository domain for single restart repair presentation.\n\n- A single LHACM-managed integration requiring restart now creates the restart repair with that repository domain as issue_domain, so Home Assistant can present the affected integration artwork instead of LHACM.\n- Multiple pending LHACM repositories remain one aggregate restart repair under LHACM.\n- Added regression coverage for JARVIS-style single-repository restart repairs.\n\nNote: LHACM cannot merge or delete HACS-owned restart repairs; one Home Assistant restart should satisfy both, and LHACM clears its own stale repairs after startup.