feat(storage): add comprehensive tests for StorageManager with memory, filesystem, and custom function backends

feat(email): implement EmailSendJob class for robust email delivery with retry logic and MX record resolution

feat(mail): restructure mail module exports for simplified access to core and delivery functionalities

ts/logger.ts

@@ -1,11 +0,0 @@
-/**
- * Logger module
- * Simple logging for mailer
- */
-
-export const logger = {
-  log: (level: string, message: string, ...args: any[]) => {
-    const timestamp = new Date().toISOString();
-    console.log(`[${timestamp}] [${level.toUpperCase()}] ${message}`, ...args);
-  },
-};