feat(ui) : add DTOs and services for calendar fields, recurrence, and Zimbra settings

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/services/task-recurrences.ts

@@ -0,0 +1,25 @@
+import type { TaskRecurrence, TaskRecurrenceWrite } from './dto/task-recurrence'
+
+export function useTaskRecurrenceService() {
+    const api = useApi()
+
+    async function create(payload: TaskRecurrenceWrite): Promise<TaskRecurrence> {
+        return api.post<TaskRecurrence>('/task_recurrences', payload as Record<string, unknown>, {
+            toastSuccessKey: 'taskRecurrence.created',
+        })
+    }
+
+    async function update(id: number, payload: Partial<TaskRecurrenceWrite>): Promise<TaskRecurrence> {
+        return api.patch<TaskRecurrence>(`/task_recurrences/${id}`, payload as Record<string, unknown>, {
+            toastSuccessKey: 'taskRecurrence.updated',
+        })
+    }
+
+    async function remove(id: number): Promise<void> {
+        await api.delete(`/task_recurrences/${id}`, {}, {
+            toastSuccessKey: 'taskRecurrence.deleted',
+        })
+    }
+
+    return { create, update, remove }
+}