Fix startup: Remove invalid dotenv command

- Node.js build already loads .env file
- Remove unnecessary dotenv CLI invocation with invalid -c flag
- Directly start the Node.js server

entrypoint.sh

@@ -59,4 +59,4 @@ echo "vLLM manager is ready! All 3 models available in UI."
 
 export PUBLIC_VERSION=$(node -p "require('./package.json').version")
 
-dotenv -e /app/.env -c -- node /app/build/index.js -- --host 0.0.0.0 --port 3000
+node /app/build/index.js --host 0.0.0.0 --port 3000