feature: version one notification feature implemented.

frontend/src/lib/api/notifications.ts

@@ -1,4 +1,5 @@
 import { apiClient } from '@/lib/api/client';
+import type { InboxPage, UserNotificationItem } from '@/types/notifications';
 import type { LabCaseActivityItem } from '@/types/lab-case-activity';
 import type { LabCaseTabReadTarget, TabBadgeCounts } from '@/lib/tabBadgeUtils';
 
@@ -27,4 +28,29 @@ export const notificationsApi = {
     const response = await apiClient.post('/notifications/mark-case-read', { labCaseId });
     return response.data;
   },
+
+  listInbox: async (params?: {
+    limit?: number;
+    cursor?: string;
+  }): Promise<{ success: boolean; data: InboxPage }> => {
+    const response = await apiClient.get('/notifications/inbox', { params });
+    return response.data;
+  },
+
+  inboxUnreadCount: async (): Promise<{ success: boolean; data: { count: number } }> => {
+    const response = await apiClient.get('/notifications/inbox/unread-count');
+    return response.data;
+  },
+
+  markInboxRead: async (
+    id: string,
+  ): Promise<{ success: boolean; data: UserNotificationItem | null }> => {
+    const response = await apiClient.post(`/notifications/inbox/${id}/read`);
+    return response.data;
+  },
+
+  markInboxReadAll: async (): Promise<{ success: boolean }> => {
+    const response = await apiClient.post('/notifications/inbox/read-all');
+    return response.data;
+  },
 };