feat(mailer-smtp): implement in-process SMTP server and management IPC integration

dist_ts/mail/routing/classes.unified.email.server.d.ts

@@ -164,6 +164,17 @@ export declare class UnifiedEmailServer extends EventEmitter {
      * Stop the unified email server
      */
     stop(): Promise<void>;
+    /**
+     * Handle an emailReceived event from the Rust SMTP server.
+     * Decodes the email data, processes it through the routing system,
+     * and sends back the result via the correlation-ID callback.
+     */
+    private handleRustEmailReceived;
+    /**
+     * Handle an authRequest event from the Rust SMTP server.
+     * Validates credentials and sends back the result.
+     */
+    private handleRustAuthRequest;
     /**
      * Verify inbound email security (DKIM/SPF/DMARC) using the Rust bridge.
      * Falls back gracefully if the bridge is not running.