feat(15-03): fire-and-forget phishing detection on ticket.created webhook

- triggerPhishingDetection() mirrors triggerWorkflowEngine's payload.entity-first shape
- reads createdByContactID (Autotask field) into created_by_contact_id, per entity-mapper.ts:211
- called alongside the existing workflow-engine trigger, not awaited in the request path

lib/services/webhook-service.ts

@@ -14,6 +14,7 @@ import { workflowEngine } from './workflow-engine';
 import { ticketWorkflowEngine } from './ticket-workflow-engine';
 import '../services/workflow-steps'; // Register all workflow step executors
 import { WorkflowEvent, TicketData } from '../types/workflow';
+import { detectPhishingTicket, DetectableTicket } from './phishing-detector';
 
 export class WebhookService {
   private _autotaskClient: AutotaskClient | null = null;
@@ -114,6 +115,9 @@ export class WebhookService {
         this.triggerWorkflowEngine(payload).catch(err =>
           console.error('[WEBHOOK] Workflow engine error:', err)
         );
+        this.triggerPhishingDetection(payload).catch(err =>
+          console.error('[WEBHOOK] Phishing detection error:', err)
+        );
       }
 
 
@@ -436,6 +440,45 @@ export class WebhookService {
     // DEPRECATED: old workflow engine (will be removed after testing period)
     // await workflowEngine.process(event);
   }
+
+  /**
+   * Trigger phishing detection for a new ticket.
+   * Runs asynchronously — does not block webhook response. Mirrors
+   * triggerWorkflowEngine's "prefer inline payload.entity, else payload.entityId" shape.
+   */
+  private async triggerPhishingDetection(payload: AutotaskWebhookPayload): Promise<void> {
+    let ticket: DetectableTicket;
+
+    if (payload.entity) {
+      // NOTE: Autotask's requester field is `createdByContactID` (mapped to
+      // created_by_contact_id at lib/utils/entity-mapper.ts:211). There is no
+      // similarly-named alternative field — since payload.entity is typed
+      // Record<string, any>, a wrong field name would compile cleanly but
+      // silently produce undefined at runtime.
+      ticket = {
+        id: payload.entityId,
+        ticket_number: payload.entity.ticketNumber || null,
+        title: payload.entity.title || null,
+        description: payload.entity.description || null,
+        company_id: payload.entity.companyID || null,
+        contact_id: payload.entity.contactID || null,
+        created_by_contact_id: payload.entity.createdByContactID || null,
+      };
+    } else {
+      ticket = {
+        id: payload.entityId,
+        ticket_number: null,
+        title: null,
+        description: null,
+        company_id: null,
+        contact_id: null,
+        created_by_contact_id: null,
+      };
+    }
+
+    console.log(`[WEBHOOK] Triggering phishing detection for ticket ${payload.entityId}`);
+    await detectPhishingTicket(ticket);
+  }
 }
 
 // Export singleton instance