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/paths.ts

@@ -1,27 +0,0 @@
-/**
- * Paths module
- * Project paths for mailer
- */
-
-import * as plugins from './plugins.ts';
-
-// Get package directory (where the script is run from)
-export const packageDir = Deno.cwd();
-
-// Config directory
-export const configDir = plugins.path.join(Deno.env.get('HOME') || '/root', '.mailer');
-
-// Data directory
-export const dataDir = plugins.path.join(configDir, 'data');
-
-// Logs directory
-export const logsDir = plugins.path.join(configDir, 'logs');
-
-// DKIM keys directory
-export const dkimKeysDir = plugins.path.join(configDir, 'dkim-keys');
-
-// Keys directory (alias for compatibility)
-export const keysDir = dkimKeysDir;
-
-// DNS records directory
-export const dnsRecordsDir = plugins.path.join(configDir, 'dns-records');