feat(rust): scaffold Rust workspace and fix TypeScript build errors

- Add @git.zone/tsrust with linux_amd64/linux_arm64 cross-compilation
- Scaffold Rust workspace with 5 crates: mailer-core, mailer-smtp, mailer-security, mailer-napi, mailer-bin
- Fix all TypeScript compilation errors for upgraded dependencies (smartfile v13, mailauth v4.13, smartproxy v23)
- Replace smartfile.fs/memory with @push.rocks/smartfs throughout codebase
- Fix .ts import extensions to .js for NodeNext module resolution
- Update DKIMSignOptions usage to match mailauth v4.13 API
- Add MTA error classes with permissive signatures for legacy SMTP client
- Replace removed DcRouter/StorageManager/deliverability imports with local interfaces

ts/mail/delivery/classes.delivery.system.ts

@@ -1,17 +1,17 @@
-import * as plugins from '../../plugins.ts';
+import * as plugins from '../../plugins.js';
 import { EventEmitter } from 'node:events';
 import * as net from 'node:net';
 import * as tls from 'node:tls';
-import { logger } from '../../logger.ts';
+import { logger } from '../../logger.js';
 import { 
   SecurityLogger, 
   SecurityLogLevel, 
   SecurityEventType 
-} from '../../security/index.ts';
-import { UnifiedDeliveryQueue, type IQueueItem } from './classes.delivery.queue.ts';
-import type { Email } from '../core/classes.email.ts';
-import type { UnifiedEmailServer } from '../routing/classes.unified.email.server.ts';
-import type { SmtpClient } from './smtpclient/smtp-client.ts';
+} from '../../security/index.js';
+import { UnifiedDeliveryQueue, type IQueueItem } from './classes.delivery.queue.js';
+import type { Email } from '../core/classes.email.js';
+import type { UnifiedEmailServer } from '../routing/classes.unified.email.server.js';
+import type { SmtpClient } from './smtpclient/smtp-client.js';
 
 /**
  * Delivery status enumeration
@@ -768,7 +768,11 @@ export class MultiModeDeliverySystem extends EventEmitter {
       const rawEmail = email.toRFC822String();
       
       // Sign the email
+      const dkimPrivateKey = (await this.emailServer.dkimCreator.readDKIMKeys(domainName)).privateKey;
       const signResult = await plugins.dkimSign(rawEmail, {
+        signingDomain: domainName,
+        selector: keySelector,
+        privateKey: dkimPrivateKey,
         canonicalization: 'relaxed/relaxed',
         algorithm: 'rsa-sha256',
         signTime: new Date(),
@@ -776,7 +780,7 @@ export class MultiModeDeliverySystem extends EventEmitter {
           {
             signingDomain: domainName,
             selector: keySelector,
-            privateKey: (await this.emailServer.dkimCreator.readDKIMKeys(domainName)).privateKey,
+            privateKey: dkimPrivateKey,
             algorithm: 'rsa-sha256',
             canonicalization: 'relaxed/relaxed'
           }