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/security/classes.dkimverifier.ts

@@ -1,7 +1,7 @@
-import * as plugins from '../../plugins.ts';
+import * as plugins from '../../plugins.js';
 // MtaService reference removed
-import { logger } from '../../logger.ts';
-import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.ts';
+import { logger } from '../../logger.js';
+import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.js';
 
 /**
  * Result of a DKIM verification
@@ -66,10 +66,10 @@ export class DKIMVerifier {
           
           const result: IDkimVerificationResult = {
             isValid,
-            domain: dkimResult.domain,
+            domain: dkimResult.signingDomain,
             selector: dkimResult.selector,
             status: dkimResult.status.result,
-            signatureFields: dkimResult.signature,
+            signatureFields: (dkimResult as any).signature,
             details: options.returnDetails ? verificationMailauth : undefined
           };
           
@@ -79,19 +79,19 @@ export class DKIMVerifier {
             timestamp: Date.now()
           });
           
-          logger.log(isValid ? 'info' : 'warn', `DKIM Verification using mailauth: ${isValid ? 'pass' : 'fail'} for domain ${dkimResult.domain}`);
+          logger.log(isValid ? 'info' : 'warn', `DKIM Verification using mailauth: ${isValid ? 'pass' : 'fail'} for domain ${dkimResult.signingDomain}`);
           
           // Enhanced security logging
           SecurityLogger.getInstance().logEvent({
             level: isValid ? SecurityLogLevel.INFO : SecurityLogLevel.WARN,
             type: SecurityEventType.DKIM,
-            message: `DKIM verification ${isValid ? 'passed' : 'failed'} for domain ${dkimResult.domain}`,
+            message: `DKIM verification ${isValid ? 'passed' : 'failed'} for domain ${dkimResult.signingDomain}`,
             details: {
               selector: dkimResult.selector,
-              signatureFields: dkimResult.signature,
+              signatureFields: (dkimResult as any).signature,
               result: dkimResult.status.result
             },
-            domain: dkimResult.domain,
+            domain: dkimResult.signingDomain,
             success: isValid
           });