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.mta.config.ts

@@ -1,25 +1,25 @@
-import * as plugins from '../../plugins.ts';
-import * as paths from '../../paths.ts';
-import type { UnifiedEmailServer } from '../routing/classes.unified.email.server.ts';
+import * as plugins from '../../plugins.js';
+import * as paths from '../../paths.js';
+import type { UnifiedEmailServer } from '../routing/classes.unified.email.server.js';
 
 /**
  * Configures email server storage settings 
  * @param emailServer Reference to the unified email server
  * @param options Configuration options containing storage paths
  */
-export function configureEmailStorage(emailServer: UnifiedEmailServer, options: any): void {
+export async function configureEmailStorage(emailServer: UnifiedEmailServer, options: any): Promise<void> {
   // Extract the receivedEmailsPath if available
   if (options?.emailPortConfig?.receivedEmailsPath) {
     const receivedEmailsPath = options.emailPortConfig.receivedEmailsPath;
-    
+
     // Ensure the directory exists
-    plugins.smartfile.fs.ensureDirSync(receivedEmailsPath);
-    
+    await plugins.smartfs.directory(receivedEmailsPath).recursive().create();
+
     // Set path for received emails
     if (emailServer) {
       // Storage paths are now handled by the unified email server system
-      plugins.smartfile.fs.ensureDirSync(paths.receivedEmailsDir);
-      
+      await plugins.smartfs.directory(paths.receivedEmailsDir).recursive().create();
+
       console.log(`Configured email server to store received emails to: ${receivedEmailsPath}`);
     }
   }
@@ -30,8 +30,8 @@ export function configureEmailStorage(emailServer: UnifiedEmailServer, options:
  * @param emailServer Reference to the unified email server
  * @param config Configuration settings for email server
  */
-export function configureEmailServer(
-  emailServer: UnifiedEmailServer, 
+export async function configureEmailServer(
+  emailServer: UnifiedEmailServer,
   config: {
     ports?: number[];
     hostname?: string;
@@ -42,32 +42,32 @@ export function configureEmailServer(
     };
     storagePath?: string;
   }
-): boolean {
+): Promise<boolean> {
   if (!emailServer) {
     console.error('Email server not available');
     return false;
   }
-  
+
   // Configure the email server with updated options
   const serverOptions = {
     ports: config.ports || [25, 587, 465],
     hostname: config.hostname || 'localhost',
     tls: config.tls
   };
-  
+
   // Update the email server options
   emailServer.updateOptions(serverOptions);
-  
+
   console.log(`Configured email server on ports ${serverOptions.ports.join(', ')}`);
-  
+
   // Set up storage path if provided
   if (config.storagePath) {
-    configureEmailStorage(emailServer, {
+    await configureEmailStorage(emailServer, {
       emailPortConfig: {
         receivedEmailsPath: config.storagePath
       }
     });
   }
-  
+
   return true;
 }