Remove Icecast/Liquidsoap, migrate fully to Harmony/CL-Streamer
- Delete all Icecast/Liquidsoap config files, Dockerfiles, and .liq scripts
- Remove icecast/liquidsoap services from docker-compose.yml (keep postgres)
- Remove liquidsoap-command, parse-liquidsoap-metadata, format-remaining-time
- Remove liquidsoap-command-succeeded-p, liquidsoap-reload-and-skip
- Remove icecast-now-playing, check-icecast-status, check-liquidsoap-status
- Remove icecast XML polling from listener-stats.lisp
- Replace asteroid/liquidsoap/* APIs with asteroid/stream/* APIs
- Simplify all if-harmony-else-liquidsoap branches to Harmony-only
- Update admin template: single Stream Status card, pipeline controls
- Update about.ctml credits: Harmony + CL-Mixed replace Icecast + Liquidsoap
- Update status.ctml server name to CL-Streamer / Harmony
- Update parenscript/admin.lisp: stream-* functions, new API endpoints
- Export pipeline-running-p from cl-streamer/harmony package
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