radio: /srv/betoniarka paths, in-container Icecast, drop ffmpeg.pref

Per review of the first radio-container cut:

- radio_conjurer.liq: replace the cargo-culted /home/pi/Conjurer and
  /home/pi/MediaFolder paths with the container layout -
  /srv/betoniarka/data (playlists, script.params, persistence/radio logs),
  /srv/betoniarka/music (library + emergency track) and
  /srv/betoniarka/secrets/icecast_credentials.json;
  interactive.persistent now uses an absolute path;
  output.icecast targets host="localhost" (icecast lives in the container)
- Icecast2 now runs INSIDE the radio container: entrypoint renders
  /etc/icecast2/icecast.xml from docker/icecast.xml.tpl, filling
  source/admin/relay passwords from the secret provisioned at install time
  (same pattern as the bot's netrc); optional admin_password/relay_password
  fields default to password; icecast starts as its unprivileged user;
  port 8000 exposed for listeners; extra_hosts hack removed
- compose.radio.yaml: same-path mounts for /srv/betoniarka/{data,music,secrets}
- ffmpeg.pref removed from the repo (the pin only mattered against the
  RPi OS repo; bookworm ships the right FFmpeg 5.x natively) - verdict
  preserved in the docs and the legacy installer note updated
- docs: updated radio section (volumes, secret provisioning, wire-up)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

conjurer_musician/radio_conjurer.liq

@@ -1,16 +1,16 @@
-# FILEPATH: /home/mtuszowski/conjurer/conjurer_musician/radio_conjurer.liq
+# Radio Conjurer - Liquidsoap script (containerised paths: /srv/betoniarka/*)
 
 # This script sets up a Liquidsoap radio stream with various features and configurations.
 
 # Load icecast credentials from a JSON file
-let json.parse credentials  = file.contents("/home/pi/Conjurer/icecast_credentials.json")
+let json.parse credentials  = file.contents("/srv/betoniarka/secrets/icecast_credentials.json")
 
 # Enable replaygain metadata processing
 enable_replaygain_metadata()
 
 # Set up a playlog for tracking played tracks
 
-l = playlog(duration = 72000.0, persistency="/home/pi/Conjurer/persistence.log")
+l = playlog(duration = 72000.0, persistency="/srv/betoniarka/data/persistence.log")
 
 # Function to check if a track can be played based on its metadata
 def check(r)
@@ -25,20 +25,20 @@ def check(r)
 end
 
 # Define playlists to be used in the stream
-s1 = replaygain(playlist(reload_mode="watch", check_next=check, "/home/pi/Conjurer/all_playlist.playlist"))
-s2 = replaygain(playlist(reload_mode="watch", check_next=check, "/home/pi/Conjurer/priority_queue.playlist"))
-s3 = replaygain(playlist(reload_mode="watch", check_next=check, "/home/pi/Conjurer/hit.playlist"))
+s1 = replaygain(playlist(reload_mode="watch", check_next=check, "/srv/betoniarka/data/all_playlist.playlist"))
+s2 = replaygain(playlist(reload_mode="watch", check_next=check, "/srv/betoniarka/data/priority_queue.playlist"))
+s3 = replaygain(playlist(reload_mode="watch", check_next=check, "/srv/betoniarka/data/hit.playlist"))
 
 # Create a request queue for user-generated requests
 requests_queue = request.queue()
 
 # Function to process the request queue and add new requests
 def queue_processing()
-    text=file.lines("/home/pi/Conjurer/request.playlist")
+    text=file.lines("/srv/betoniarka/data/request.playlist")
     if text != [] then
         list.iter(fun(item) -> requests_queue.push.uri(item), text)
-        file.remove("/home/pi/Conjurer/request.playlist")
-        f = file.open("/home/pi/Conjurer/request.playlist", create=true)
+        file.remove("/srv/betoniarka/data/request.playlist")
+        f = file.open("/srv/betoniarka/data/request.playlist", create=true)
         f.close()
     end
 end
@@ -63,7 +63,7 @@ end
 s4 = random(id="randomizer", weights=[2, 3, 5], [s1, s2, s3])
 
 # Load jingles playlist
-jingles = (playlist(reload_mode="watch", "/home/pi/Conjurer/jingles.playlist"))
+jingles = (playlist(reload_mode="watch", "/srv/betoniarka/data/jingles.playlist"))
 
 # Create the main stream with random playlist and jingles
 s = rotate(id="randomizer", weights=[10, 1], [s4, jingles])
@@ -111,7 +111,7 @@ s=switch(track_sensitive=true,
 # Configure logging settings
 log_to_stdout = true
 log_to_file = true
-logpath = "/home/pi/Conjurer/radio_log.log"
+logpath = "/srv/betoniarka/data/radio_log.log"
 loglevel = 3
 set("log.stdout", log_to_stdout)
 set("log.level", loglevel)
@@ -120,7 +120,7 @@ set("log.level", loglevel)
 set("log.file", log_to_file)
 set("log.file.path", logpath)
 # Set up emergency fallback track
-emergency = single("/home/pi/MediaFolder/mp3/Youtube/Dr. Peacock - Trip to Ireland [GvrvQTUbUcA].mp3")
+emergency = single("/srv/betoniarka/music/Youtube/Dr. Peacock - Trip to Ireland [GvrvQTUbUcA].mp3")
 radio =  fallback(id="switcher2", track_sensitive=false, [s, emergency])
 
 # Set up an interactive control for skipping tracks
@@ -150,11 +150,11 @@ thread.run(every=15., check_skip)
 
 
 # Enable persistent script parameters
-interactive.persistent("script.params")
+interactive.persistent("/srv/betoniarka/data/script.params")
 
 # Configure output formats and destinations
 
-output.icecast(%mp3, host="radio", port=8000, password=credentials.password, icy_metadata="true", mount="mp3-stream", radio)
+output.icecast(%mp3, host="localhost", port=8000, password=credentials.password, icy_metadata="true", mount="mp3-stream", radio)
 output.pulseaudio(radio)
 #output.file.hls("/tmp/hls", [("mp3-low", %mp3(bitrate=96)), ("mp3-hi", %mp3(bitrate=160))], radio)
 # Uncomment the following lines to enable additional output formats