fix(mail): align queue, outbound hostname, and DKIM selector behavior across the mail server APIs

ts/mail/routing/classes.email.router.ts

@@ -1,5 +1,6 @@
 import * as plugins from '../../plugins.js';
 import { EventEmitter } from 'node:events';
+import { hasStorageManagerMethods, type IStorageManagerLike } from '../interfaces.storage.js';
 import type { IEmailRoute, IEmailMatch, IEmailAction, IEmailContext } from './interfaces.js';
 import type { Email } from '../core/classes.email.js';
 
@@ -9,7 +10,7 @@ import type { Email } from '../core/classes.email.js';
 export class EmailRouter extends EventEmitter {
   private routes: IEmailRoute[];
   private patternCache: Map<string, boolean> = new Map();
-  private storageManager?: any; // StorageManager instance
+  private storageManager?: IStorageManagerLike;
   private persistChanges: boolean;
   
   /**
@@ -18,7 +19,7 @@ export class EmailRouter extends EventEmitter {
    * @param options Router options
    */
   constructor(routes: IEmailRoute[], options?: {
-    storageManager?: any;
+    storageManager?: IStorageManagerLike;
     persistChanges?: boolean;
   }) {
     super();
@@ -27,7 +28,7 @@ export class EmailRouter extends EventEmitter {
     this.persistChanges = options?.persistChanges ?? !!this.storageManager;
     
     // If storage manager is provided, try to load persisted routes
-    if (this.storageManager) {
+    if (hasStorageManagerMethods(this.storageManager, ['get'])) {
       this.loadRoutes({ merge: true }).catch(error => {
         console.error(`Failed to load persisted routes: ${error.message}`);
       });
@@ -394,7 +395,7 @@ export class EmailRouter extends EventEmitter {
    * Save current routes to storage
    */
   public async saveRoutes(): Promise<void> {
-    if (!this.storageManager) {
+    if (!hasStorageManagerMethods(this.storageManager, ['set'])) {
       this.emit('persistenceWarning', 'Cannot save routes: StorageManager not configured');
       return;
     }
@@ -425,7 +426,7 @@ export class EmailRouter extends EventEmitter {
     merge?: boolean; // Merge with existing routes
     replace?: boolean; // Replace existing routes
   }): Promise<IEmailRoute[]> {
-    if (!this.storageManager) {
+    if (!hasStorageManagerMethods(this.storageManager, ['get'])) {
       this.emit('persistenceWarning', 'Cannot load routes: StorageManager not configured');
       return [];
     }
@@ -572,4 +573,4 @@ export class EmailRouter extends EventEmitter {
   public getRoute(name: string): IEmailRoute | undefined {
     return this.routes.find(r => r.name === name);
   }
-}
+}