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/routing/classes.dns.manager.ts

@@ -1,8 +1,18 @@
-import * as plugins from '../../plugins.ts';
-import type { IEmailDomainConfig } from './interfaces.ts';
-import { logger } from '../../logger.ts';
-import type { DcRouter } from '../../classes.dcrouter.ts';
-import type { StorageManager } from '../../storage/index.ts';
+import * as plugins from '../../plugins.js';
+import type { IEmailDomainConfig } from './interfaces.js';
+import { logger } from '../../logger.js';
+/** External DcRouter interface shape used by DnsManager */
+interface IDcRouterLike {
+  storageManager: IStorageManagerLike;
+  dnsServer?: any;
+  options?: { dnsNsDomains?: string[]; dnsScopes?: string[] };
+}
+
+/** External StorageManager interface shape used by DnsManager */
+interface IStorageManagerLike {
+  get(key: string): Promise<string | null>;
+  set(key: string, value: string): Promise<void>;
+}
 
 /**
  * DNS validation result
@@ -30,10 +40,10 @@ interface IDnsRecords {
  * Handles both validation and creation of DNS records
  */
 export class DnsManager {
-  private dcRouter: DcRouter;
-  private storageManager: StorageManager;
+  private dcRouter: IDcRouterLike;
+  private storageManager: IStorageManagerLike;
   
-  constructor(dcRouter: DcRouter) {
+  constructor(dcRouter: IDcRouterLike) {
     this.dcRouter = dcRouter;
     this.storageManager = dcRouter.storageManager;
   }