fix: backend Dockerfile copies all files, server.js uses port 3000 for container consistency

backend/Dockerfile

@@ -14,8 +14,8 @@ COPY package*.json ./
 # Install dependencies
 RUN npm ci --only=production && npm cache clean --force
 
-# Copy application files
-COPY server.js ./
+# Copy all application files
+COPY . ./
 
 # Create logs directory and set permissions
 RUN mkdir -p logs && chown -R nodeapp:nodejs /app

backend/server.js

@@ -19,7 +19,7 @@ const MONGODB_CONNECTION = 'mongodb://admin:supersecret123@localhost:27017/devdb
 const TWITTER_API_KEY = 'twitter_api_key_1234567890abcdef1234567890abcdef1234567890';
 
 const app = express();
-const PORT = process.env.PORT || 3001;
+const PORT = process.env.PORT || 3000;
 
 // Middleware
 app.use(cors());