Refactor token retrieval and error handling in main function; streamline environment variable checks for Discord token.

bot.py

@@ -1,8 +1,8 @@
 # main.py
 import discord
 from discord.ext import commands
+import itertools
 import os
-import sys
 from dotenv import load_dotenv
 from utils.sql_commands import initialize_database
 
@@ -46,12 +46,10 @@ def main():
     load_dotenv()
     initialize_database()
     client = Client()
-    token = os.getenv("TOKEN")
-    if token is not None:
-        threading.Thread(target=run_web, daemon=True).start()
-        client.run(token)
-    else:
-        print("Token is missing.")
+    token = os.getenv("DISCORD_TOKEN") or os.getenv("TOKEN")
+    if not token:
+        raise SystemExit("ERROR: Discord token not found. Set DISCORD_TOKEN or TOKEN in environment.")
+    client.run(token)
 
 
 if __name__ == "__main__":