Fix Request Queue Memory Leaks

[hcaslan]

Description:

The RequestQueue class has potential memory leaks and doesn't handle queue cleanup properly.

Memory Leak Issues:

// In requestQueue.js
async add(requestFn) {
  return new Promise((resolve, reject) => {
    this.queue.push({
      request: requestFn,
      resolve,
      reject
    });
    // These promises can accumulate if process() fails
  });
}

Problems:

• Failed requests leave promises in memory
• No queue size limits - can grow indefinitely
• No cleanup mechanism for stale requests
• Missing request timeout handling
• No metrics for queue performance monitoring

Required Fixes:

• Add queue size limits with configurable overflow behavior
• Implement proper cleanup for failed/completed requests
• Add request timeout handling in queue
• Memory usage monitoring and warnings
• Queue performance metrics