feature: sending invitation link for newly created staff implemented.

frontend/src/lib/api/staff.ts

@@ -6,6 +6,10 @@ export interface StaffMemberDto {
   email: string;
   name: string;
   isOwner: boolean;
+  isActive: boolean;
+  invitationStatus: 'ACTIVE' | 'PENDING' | 'EXPIRED';
+  invitedAt: string | null;
+  acceptedAt: string | null;
   permissions: string[] | null;
 }
 
@@ -27,7 +31,20 @@ export interface InviteStaffResponse {
     membershipId: string;
     userId: string;
     email: string;
-    temporaryPassword: string | null;
+    invitationId: string | null;
+    invitationUrl: string | null;
+    invitationStatus: 'PENDING' | 'ACCEPTED';
+  };
+}
+
+export interface PreviewInviteResponse {
+  success: boolean;
+  data: {
+    email: string;
+    name: string;
+    organizationName: string;
+    expiresAt: string;
+    status: 'PENDING' | 'ACCEPTED';
   };
 }
 
@@ -46,6 +63,20 @@ export const staffApi = {
     return response.data;
   },
 
+  previewInvite: async (token: string): Promise<PreviewInviteResponse> => {
+    const response = await apiClient.get(`/staff/invitations/preview?token=${encodeURIComponent(token)}`);
+    return response.data;
+  },
+
+  acceptInvite: async (body: {
+    token: string;
+    password: string;
+    name: string;
+  }): Promise<{ success: boolean; message: string; data: { email: string } }> => {
+    const response = await apiClient.post('/staff/invitations/accept', body);
+    return response.data;
+  },
+
   updateMember: async (
     membershipId: string,
     body: { name?: string; permissionNames?: string[] },