feat: add workapp mail sync API

ts/classes.dcrouter.ts

@@ -31,7 +31,7 @@ import { SecurityLogger, ContentScanner, IPReputationChecker, SecurityPolicyMana
 import { type IHttp3Config, augmentRoutesWithHttp3 } from './http3/index.js';
 import { DnsManager } from './dns/manager.dns.js';
 import { AcmeConfigManager } from './acme/manager.acme-config.js';
-import { EmailDomainManager, SmartMtaStorageManager, buildEmailDnsRecords } from './email/index.js';
+import { EmailDomainManager, SmartMtaStorageManager, WorkAppMailManager, buildEmailDnsRecords } from './email/index.js';
 import type { IRoute } from '../ts_interfaces/data/route-management.js';
 import type { ISecurityCompiledPolicy } from '../ts_interfaces/data/security-policy.js';
 
@@ -285,6 +285,7 @@ export class DcRouter {
   // ACME configuration (DB-backed singleton, replaces tls.contactEmail)
   public acmeConfigManager?: AcmeConfigManager;
   public emailDomainManager?: EmailDomainManager;
+  public workAppMailManager: WorkAppMailManager;
   public securityPolicyManager?: SecurityPolicyManager;
 
   // Auto-discovered public IP (populated by generateAuthoritativeRecords)
@@ -339,6 +340,7 @@ export class DcRouter {
     this.storageManager = new SmartMtaStorageManager(
       plugins.path.join(this.resolvedPaths.dataDir, 'smartmta-storage')
     );
+    this.workAppMailManager = new WorkAppMailManager(this);
 
     // Initialize service manager and register all services
     this.serviceManager = new plugins.taskbuffer.ServiceManager({
@@ -1630,7 +1632,7 @@ export class DcRouter {
     }
     
     // Create config with mapped ports
-    const emailConfig: IUnifiedEmailServerOptions = {
+    const emailConfig: IUnifiedEmailServerOptions = await this.workAppMailManager.applyStoredIdentitiesToEmailConfig({
       ...this.options.emailConfig,
       domains: transformedDomains,
       ports: this.options.emailConfig.ports.map(port => portMapping[port] || port + 10000),
@@ -1640,7 +1642,7 @@ export class DcRouter {
         persistentPath: plugins.path.join(this.resolvedPaths.dataDir, 'smartmta-queue'),
         ...this.options.emailConfig.queue,
       },
-    };
+    });
     
     // Create unified email server
     this.emailServer = new UnifiedEmailServer(this, emailConfig);