docs(docker-compose): update environment variables with comments

Add commented-out configuration options to document available settings

docker-compose.yml

@@ -6,4 +6,18 @@ services:
     restart: unless-stopped
     environment:
       - PORT=3000
-      - MAX_PEERS=10000
+
+      # --- Add-ons ---
+      # - ENABLE_CHAT=false        # Enable decentralized chat
+      # - ENABLE_MAP=false         # Enable peer map visualization
+
+      # --- Refinements ---
+      # - MAX_PEERS=50000          # Max peers to track in memory
+      # - MAX_CONNECTIONS=15       # Max active P2P connections
+      # - HEARTBEAT_INTERVAL=30000 # Heartbeat frequency (ms)
+      # - CONNECTION_ROTATION_INTERVAL=300000 # Connection rotation frequency (ms)
+      # - PEER_TIMEOUT=45000       # Time before peer is considered offline (ms)
+      # - MAX_MESSAGE_SIZE=2048    # Max message size (bytes)
+      # - MAX_RELAY_HOPS=2         # Max message relay hops
+      # - CHAT_RATE_LIMIT=5000     # Chat rate limit window (ms)
+      # - VISUAL_LIMIT=500         # Max particles on dashboard