v2.3: Major refactoring, Lavalink music system, Spotify support, CI/CD

- Full refactoring: max 200 lines/file, max 3 files/dir, KISS/DRY/SOLID
- Lavalink client 3.4.0 + LavaSrc plugin (Spotify, Apple Music, Deezer)
- 3-bot architecture: main (!), music (q!), radio (r!)
- Filters: bassboost, nightcore, vaporwave, equalizer
- Slash commands for music (/play, /skip, etc.)
- Persistent queue in SQLite, auto-leave timer
- Radio manager with auto-reconnect
- Custom welcome GIF greetings via nekos.life
- JDA 5.6.1, gson 2.14, hikaricp 6.3, all deps updated
- Fixed YouTube playback via ytmsearch (LavaSrc)
- CI/CD: Docker publish + release workflows
- SpotBugs: all real bugs fixed, ignoreFailures=false
- Checkstyle: Google Style (adapted), 0 violations

docker-compose.yml

@@ -1,21 +1,44 @@
-version: "3.9"
-
 services:
+  lavalink:
+    image: ghcr.io/lavalink-devs/lavalink:4-alpine
+    container_name: loki-lavalink
+    restart: unless-stopped
+    ports:
+      - "2333:2333"
+    volumes:
+      - ./lavalink/application.yml:/opt/Lavalink/application.yml:ro
+      - ./lavalink/plugins/:/opt/Lavalink/plugins/
+      - lavalink-data:/opt/Lavalink/data
+    environment:
+      JAVA_OPTS: "-Xmx256M -Xms64M"
+      SPOTIFY_CLIENT_ID: ${SPOTIFY_CLIENT_ID}
+      SPOTIFY_CLIENT_SECRET: ${SPOTIFY_CLIENT_SECRET}
+
   bot:
     build: .
     container_name: loki-bot
     restart: unless-stopped
+    depends_on:
+      - lavalink
     ports:
       - "8712:8712"
     environment:
       DISCORD_BOT_TOKEN: ${DISCORD_BOT_TOKEN}
+      DISCORD_BOT_TOKEN_MUSIC: ${DISCORD_BOT_TOKEN_MUSIC}
+      DISCORD_BOT_TOKEN_RADIO: ${DISCORD_BOT_TOKEN_RADIO}
       BOT_PREFIX: ${BOT_PREFIX:-!}
       BOT_ACTIVITY: ${BOT_ACTIVITY:-Используй !help}
       HEALTH_HTTP_PORT: ${HEALTH_HTTP_PORT:-8712}
       SUPER_ADMIN_ID: ${SUPER_ADMIN_ID}
       DB_PATH: /app/data/bot.db
+      LAVALINK_HOST: lavalink
+      LAVALINK_PORT: "2333"
+      LAVALINK_PASSWORD: Hch4HiVCxkKs9JPiSnrt4Q
+      SPOTIFY_CLIENT_ID: ${SPOTIFY_CLIENT_ID}
+      SPOTIFY_CLIENT_SECRET: ${SPOTIFY_CLIENT_SECRET}
     volumes:
       - bot-data:/app/data
 
 volumes:
   bot-data:
+  lavalink-data: