Add Jellyfin service to ansible inventory with hardware
transcoding and Casdoor SSO configuration. Configure
Alloy syslog listener to capture Jellyfin logs to Loki.
Update documentation with new service mapping and S3
bucket credential retrieval instructions.
Replaces the minimal project description with a comprehensive README
including a component overview table, quick start instructions, common
Ansible operations, and links to detailed documentation. Aligns with
Red Panda Approval™ standards.
