fix(mail/delivery): Centralize runtime/plugin imports and switch modules to use plugins exports; unify EventEmitter usage; update Deno dependencies and small path/server refactors

ts/mail/delivery/smtpclient/connection-manager.ts

@@ -3,20 +3,18 @@
  * Connection pooling and lifecycle management
  */
 
-import * as net from 'node:net';
-import * as tls from 'node:tls';
-import { EventEmitter } from 'node:events';
+import * as plugins from '../../../plugins.ts';
 import { DEFAULTS, CONNECTION_STATES } from './constants.ts';
-import type { 
-  ISmtpClientOptions, 
-  ISmtpConnection, 
+import type {
+  ISmtpClientOptions,
+  ISmtpConnection,
   IConnectionPoolStatus,
-  ConnectionState 
+  ConnectionState
 } from './interfaces.ts';
 import { logConnection, logDebug } from './utils/logging.ts';
 import { generateConnectionId } from './utils/helpers.ts';
 
-export class ConnectionManager extends EventEmitter {
+export class ConnectionManager extends plugins.EventEmitter {
   private options: ISmtpClientOptions;
   private connections: Map<string, ISmtpConnection> = new Map();
   private pendingConnections: Set<string> = new Set();