Remove Lavaplayer and migrate to Lavalink

Replaced the bot's audio handling system by removing Lavaplayer dependencies and migrating to a Lavalink v4 node. Updated `MusicManager`, `TrackScheduler`, and related classes to utilize the `LavalinkClient`. Refactored playlist and track loading logic, task integrations, and event dispatch to integrate with the remote node. Deprecated the custom Udio source, preserving references for a future plugin port. Documented configuration and deployment details for the new audio architecture.

docs/reference/udio-lavalink-plugin/UdioAudioSourceManagerTest.java

@@ -0,0 +1,39 @@
+package me.bobert.netneutrality.music.source;
+/*
+ * Copyright (c) anthorob
+ *
+ * https://discord.gg/qUa6zNFZsd
+ */
+
+import com.sedmelluq.discord.lavaplayer.track.AudioItem;
+import com.sedmelluq.discord.lavaplayer.track.AudioReference;
+import com.sedmelluq.discord.lavaplayer.track.AudioTrackInfo;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+public class UdioAudioSourceManagerTest {
+
+    @Test
+    public void loadItem() {
+        AudioReference reference = new AudioReference("https://www.udio.com/songs/eNmZxqpMt9MRrjFUgYDgyi", null);
+
+        UdioAudioSourceManager udioAudioSourceManager = new UdioAudioSourceManager();
+        AudioItem loaded = udioAudioSourceManager.loadItem(null, reference);
+
+        assertNotNull(loaded);
+
+        UdioAudioTrack audioTrack = (UdioAudioTrack) loaded;
+        AudioTrackInfo info = audioTrack.getInfo();
+
+        assertNotNull(info);
+
+        assertNotNull(info.artworkUrl);
+
+        String artworkOptions = "width=3840,quality=75";
+        assertTrue(info.artworkUrl.contains(artworkOptions));
+
+    }
+}