feat(departments): add AI agent count to department cards

В состав отдела (card meta) вернул AI-агентов, как в исходной sales-карточке:
«N сотрудник(ов) · M операторов · K AI-агент(ов)».

- Backend: _department_payload отдаёт agentCount — реальное число AIAgent на
  каналах отдела (channel.department, ADR-HUB-0019).
- Frontend: тип Department.agentCount; обе карточки (sales + support).

apps/backend/hub_platform/identity/company_views.py

@@ -3,6 +3,7 @@ from rest_framework.request import Request
 from rest_framework.response import Response
 from rest_framework.views import APIView
 
+from hub_platform.ai.models import AIAgent
 from hub_platform.identity.models import Department, EmployeeRole
 
 
@@ -10,6 +11,9 @@ def _department_payload(department: Department) -> dict[str, object]:
     employees = list(department.employees.select_related("user").all())
     operators = [employee for employee in employees if employee.role == EmployeeRole.OPERATOR]
     products = [link.product for link in department.product_links.select_related("product").order_by("product__name")]
+    # AI-агенты отдела: AIAgent живёт на канале обработки (ADR-HUB-0019),
+    # канал принадлежит отделу. Считаем активных агентов каналов этого отдела.
+    agent_count = AIAgent.objects.filter(channel__department=department).count()
     return {
         "id": department.id,
         "code": department.code,
@@ -20,6 +24,7 @@ def _department_payload(department: Department) -> dict[str, object]:
         "activeOperatorCount": len(
             [employee for employee in operators if employee.user.is_active and not employee.is_blocked]
         ),
+        "agentCount": agent_count,
         "products": [{"code": product.code, "name": product.name} for product in products],
     }
 

apps/internal-ui/src/features/departments/DepartmentsPage.tsx

@@ -42,7 +42,7 @@ export function DepartmentsPage({ data, setRoute }: { data: AppData; setRoute: (
               </div>
               <div>
                 <span>Состав</span>
-                <strong>{sales.memberCount} сотрудник(ов) · {sales.operatorCount} операторов</strong>
+                <strong>{sales.memberCount} сотрудник(ов) · {sales.operatorCount} операторов · {sales.agentCount} AI-агент(ов)</strong>
               </div>
               <div>
                 <span>Связанные продукты</span>
@@ -82,7 +82,7 @@ export function DepartmentsPage({ data, setRoute }: { data: AppData; setRoute: (
               </div>
               <div>
                 <span>Состав</span>
-                <strong>{support.memberCount} сотрудник(ов) · {support.operatorCount} операторов</strong>
+                <strong>{support.memberCount} сотрудник(ов) · {support.operatorCount} операторов · {support.agentCount} AI-агент(ов)</strong>
               </div>
               <div>
                 <span>Связанные продукты</span>

apps/internal-ui/src/types.ts

@@ -48,6 +48,7 @@ export type Department = {
   memberCount: number;
   operatorCount: number;
   activeOperatorCount: number;
+  agentCount: number;
   products: Array<{ code: string; name: string }>;
 };