6919158012
Slice 3 (final) of jellyfin-service-registry. Documents the completed migration and archives the SDD change. - docs/REQUIREMENTS.md: marked the machine-level Jellyfin follow-up resolved; added a decision-log entry (Jellyfin no longer a machine service, dead media_root/path_prefix removed; global config + path_utils retained for Jellyfin->SSH path resolution). - CHANGELOG.md: struck through the old follow-up note; added a Follow-up #2 section describing the machine field + service removal. - Archived openspec/changes/jellyfin-service-registry (no active SDD changes remain). Backend ruff clean / 239 tests pass; frontend 0 lint errors / build clean / 72 tests pass.