refactor: remove voice, recording, and music/media features (gateway + backend)

- Gateway: delete voice-recording/, voice-pcm-ws/, voice/video/media handlers,
  vendor/discord-voice-fork/, voice DB repos, 2 voice migrations
- Gateway: cut voice wiring from bootstrap/shutdown/commandHandler/handler-registry,
  eventBroadcaster/eventTypes, redis-channels, moderation-types, message-capture,
  config keys, and deps (@discordjs/voice, opus, libsodium, prism-media, davey)
- Backend: delete voice/, recordings/, media/ modules + @discordjs/voice dep
- Backend: cut voice/media/recordings oRPC routers, WS gateway-PCM auth + voice
  handlers, Redis bridge voice aggregation, redis-channels voice/media constants,
  config keys, moderation-types voice items, e2e voice/recordings suites
- Keep voice DB tables (destructive migration avoided); chatbot voiceRecordings
  tool + dashboard count remain as read-only historical data access

.env.example

@@ -18,31 +18,12 @@ MONITOR_GUILD_ID=your_guild_id_here     # Target guild for text monitoring
 TEXT_GUILD_ID=optional_text_guild_id    # Override text capture guild (falls back to MONITOR_GUILD_ID)
 TEXT_CHANNEL_ID=optional_text_channel_id # Restrict text capture to a single channel
 
-# === Voice Channels ===
-# VOICE_GUILD_ID=                        # Guild for voice connection (optional)
-# VOICE_CHANNEL_ID=                      # Channel for voice connection (optional)
-
-# === Recording ===
-RECORDINGS_DIR=./recordings             # Audio file output directory (default: ./recordings)
-RECORDING_SEGMENT_MS=5000               # OGG segment duration in ms (default: 5000)
-
-# === Decoder ===
-DECODER_ROTATE_MS=5000                  # Opus decoder rotation interval in ms (default: 5000)
-DECODER_COOLDOWN_MS=30000               # Decoder error cooldown in ms (default: 30000)
-
-# === Audio ===
-AUDIO_STREAM_SILENCE_DURATION_MS=3000   # Silence threshold in ms before stopping stream (default: 3000)
-PACKET_FILTER_MIN_SIZE=8                # Minimum Opus packet size in bytes (default: 8)
-OPUS_FRAME_SIZE=960                     # Opus frame size in samples (default: 960)
-AUDIO_SAMPLE_RATE=48000                 # Audio sample rate in Hz (default: 48000)
-AUDIO_CHANNELS=2                        # Number of audio channels (default: 2)
 AVATAR_SIZE=64                          # User avatar size in pixels (default: 64)
 
 # === Webserver ===
 WEBSERVER_PORT=4001                     # Backend HTTP/WS server port (default: 4001)
 
 # === Connection ===
-VOICE_CONNECTION_TIMEOUT_MS=15000       # Voice connection timeout in ms (default: 15000)
 RECONNECT_TIMEOUT_MS=5000               # Reconnect timeout in ms (default: 5000)
 
 # === Logging ===
@@ -69,11 +50,6 @@ POSTGRES_POOL_MAX=10                    # Maximum pool connections (default: 10)
 # === Redis ===
 REDIS_URL=redis://100.121.180.82:6379        # Redis connection string (default: redis://localhost:6379)
 
-# === Voice PCM WebSocket (direct gateway→backend, bypasses Redis) ===
-VOICE_PCM_WS_ENABLED=true               # Use direct WS for PCM audio (default: true)
-BACKEND_WS_URL=ws://backend:4001/ws     # Backend WebSocket URL for gateway PCM streaming
-BACKEND_WS_TOKEN=                       # REQUIRED if VOICE_PCM_WS_ENABLED=true. Internal shared secret
-
 # === Attachments ===
 TELE_UPLOAD_URL=https://upload.asepharyana.my.id/api/upload   # Attachment upload endpoint (default)
 ATTACHMENT_UPLOAD_TIMEOUT_MS=30000      # Upload timeout in ms (default: 30000)
@@ -132,7 +108,6 @@ AUTO_DELETE_LOG_CHANNEL_ID=              # Channel ID to log auto-delete actions
 # === Retention (0 = disabled) ===
 RETENTION_MESSAGES_DAYS=0               # Message retention in days (default: 0 = off)
 RETENTION_ATTACHMENTS_DAYS=0            # Attachment retention in days (default: 0 = off)
-RETENTION_VOICE_DAYS=0                  # Voice recording retention in days (default: 0 = off)
 RETENTION_CLEANUP_INTERVAL_MS=86400000  # Cleanup interval in ms (default: 24h)
 RETENTION_DRY_RUN=true                  # Dry-run: log but do not delete (default: true)