fix(refactor): remove deprecated Port80Handler and related utilities

- Deleted event-utils.ts which contained deprecated Port80Handler and its subscribers.
- Updated index.ts to remove the export of event-utils.
- Refactored ConnectionManager to extend LifecycleComponent for better resource management.
- Added BinaryHeap implementation for efficient priority queue operations.
- Introduced EnhancedConnectionPool for managing pooled connections with lifecycle management.
- Implemented LifecycleComponent to manage timers and event listeners automatically.
- Added comprehensive tests for BinaryHeap and LifecycleComponent to ensure functionality.

test/core/utils/test.lifecycle-component.ts

@@ -0,0 +1,252 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { LifecycleComponent } from '../../../ts/core/utils/lifecycle-component.js';
+import { EventEmitter } from 'events';
+
+// Test implementation of LifecycleComponent
+class TestComponent extends LifecycleComponent {
+  public timerCallCount = 0;
+  public intervalCallCount = 0;
+  public cleanupCalled = false;
+  public testEmitter = new EventEmitter();
+  public listenerCallCount = 0;
+
+  constructor() {
+    super();
+    this.setupTimers();
+    this.setupListeners();
+  }
+
+  private setupTimers() {
+    // Set up a timeout
+    this.setTimeout(() => {
+      this.timerCallCount++;
+    }, 100);
+
+    // Set up an interval
+    this.setInterval(() => {
+      this.intervalCallCount++;
+    }, 50);
+  }
+
+  private setupListeners() {
+    this.addEventListener(this.testEmitter, 'test-event', () => {
+      this.listenerCallCount++;
+    });
+  }
+
+  protected async onCleanup(): Promise<void> {
+    this.cleanupCalled = true;
+  }
+
+  // Expose protected methods for testing
+  public testSetTimeout(handler: Function, timeout: number): NodeJS.Timeout {
+    return this.setTimeout(handler, timeout);
+  }
+
+  public testSetInterval(handler: Function, interval: number): NodeJS.Timeout {
+    return this.setInterval(handler, interval);
+  }
+
+  public testClearTimeout(timer: NodeJS.Timeout): void {
+    return this.clearTimeout(timer);
+  }
+
+  public testClearInterval(timer: NodeJS.Timeout): void {
+    return this.clearInterval(timer);
+  }
+
+  public testAddEventListener(target: any, event: string, handler: Function): void {
+    return this.addEventListener(target, event, handler);
+  }
+
+  public testIsShuttingDown(): boolean {
+    return this.isShuttingDownState();
+  }
+}
+
+tap.test('should manage timers properly', async () => {
+  const component = new TestComponent();
+  
+  // Wait for timers to fire
+  await new Promise(resolve => setTimeout(resolve, 200));
+  
+  expect(component.timerCallCount).toEqual(1);
+  expect(component.intervalCallCount).toBeGreaterThan(2);
+  
+  await component.cleanup();
+});
+
+tap.test('should manage event listeners properly', async () => {
+  const component = new TestComponent();
+  
+  // Emit events
+  component.testEmitter.emit('test-event');
+  component.testEmitter.emit('test-event');
+  
+  expect(component.listenerCallCount).toEqual(2);
+  
+  // Cleanup and verify listeners are removed
+  await component.cleanup();
+  
+  component.testEmitter.emit('test-event');
+  expect(component.listenerCallCount).toEqual(2); // Should not increase
+});
+
+tap.test('should prevent timer execution after cleanup', async () => {
+  const component = new TestComponent();
+  
+  let laterCallCount = 0;
+  component.testSetTimeout(() => {
+    laterCallCount++;
+  }, 100);
+  
+  // Cleanup immediately
+  await component.cleanup();
+  
+  // Wait for timer that would have fired
+  await new Promise(resolve => setTimeout(resolve, 150));
+  
+  expect(laterCallCount).toEqual(0);
+});
+
+tap.test('should handle child components', async () => {
+  class ParentComponent extends LifecycleComponent {
+    public child: TestComponent;
+    
+    constructor() {
+      super();
+      this.child = new TestComponent();
+      this.registerChildComponent(this.child);
+    }
+  }
+  
+  const parent = new ParentComponent();
+  
+  // Wait for child timers
+  await new Promise(resolve => setTimeout(resolve, 100));
+  
+  expect(parent.child.timerCallCount).toEqual(1);
+  
+  // Cleanup parent should cleanup child
+  await parent.cleanup();
+  
+  expect(parent.child.cleanupCalled).toBeTrue();
+  expect(parent.child.testIsShuttingDown()).toBeTrue();
+});
+
+tap.test('should handle multiple cleanup calls gracefully', async () => {
+  const component = new TestComponent();
+  
+  // Call cleanup multiple times
+  const promises = [
+    component.cleanup(),
+    component.cleanup(),
+    component.cleanup()
+  ];
+  
+  await Promise.all(promises);
+  
+  // Should only clean up once
+  expect(component.cleanupCalled).toBeTrue();
+});
+
+tap.test('should clear specific timers', async () => {
+  const component = new TestComponent();
+  
+  let callCount = 0;
+  const timer = component.testSetTimeout(() => {
+    callCount++;
+  }, 100);
+  
+  // Clear the timer
+  component.testClearTimeout(timer);
+  
+  // Wait and verify it didn't fire
+  await new Promise(resolve => setTimeout(resolve, 150));
+  
+  expect(callCount).toEqual(0);
+  
+  await component.cleanup();
+});
+
+tap.test('should clear specific intervals', async () => {
+  const component = new TestComponent();
+  
+  let callCount = 0;
+  const interval = component.testSetInterval(() => {
+    callCount++;
+  }, 50);
+  
+  // Let it run a bit
+  await new Promise(resolve => setTimeout(resolve, 120));
+  
+  const countBeforeClear = callCount;
+  expect(countBeforeClear).toBeGreaterThan(1);
+  
+  // Clear the interval
+  component.testClearInterval(interval);
+  
+  // Wait and verify it stopped
+  await new Promise(resolve => setTimeout(resolve, 100));
+  
+  expect(callCount).toEqual(countBeforeClear);
+  
+  await component.cleanup();
+});
+
+tap.test('should handle once event listeners', async () => {
+  const component = new TestComponent();
+  const emitter = new EventEmitter();
+  
+  let callCount = 0;
+  const handler = () => {
+    callCount++;
+  };
+  
+  component.testAddEventListener(emitter, 'once-event', handler, { once: true });
+  
+  // Check listener count before emit
+  const beforeCount = emitter.listenerCount('once-event');
+  expect(beforeCount).toEqual(1);
+  
+  // Emit once - the listener should fire and auto-remove
+  emitter.emit('once-event');
+  expect(callCount).toEqual(1);
+  
+  // Check listener was auto-removed
+  const afterCount = emitter.listenerCount('once-event');
+  expect(afterCount).toEqual(0);
+  
+  // Emit again - should not increase count
+  emitter.emit('once-event');
+  expect(callCount).toEqual(1);
+  
+  await component.cleanup();
+});
+
+tap.test('should not create timers when shutting down', async () => {
+  const component = new TestComponent();
+  
+  // Start cleanup
+  const cleanupPromise = component.cleanup();
+  
+  // Try to create timers during shutdown
+  let timerFired = false;
+  let intervalFired = false;
+  
+  component.testSetTimeout(() => {
+    timerFired = true;
+  }, 10);
+  
+  component.testSetInterval(() => {
+    intervalFired = true;
+  }, 10);
+  
+  await cleanupPromise;
+  await new Promise(resolve => setTimeout(resolve, 50));
+  
+  expect(timerFired).toBeFalse();
+  expect(intervalFired).toBeFalse();
+});
+
+tap.start();