feat: implement CSV bulk user upload functionality

adminfront/src/lib/adminApi.ts

@@ -397,6 +397,27 @@ export type UserUpdateRequest = {
   jobTitle?: string;
 };
 
+export type BulkUserItem = {
+  email: string;
+  name: string;
+  phone?: string;
+  role?: string;
+  companyCode?: string;
+  department?: string;
+  metadata?: Record<string, unknown>;
+};
+
+export type BulkUserResult = {
+  email: string;
+  success: boolean;
+  message?: string;
+  userId?: string;
+};
+
+export type BulkUserResponse = {
+  results: BulkUserResult[];
+};
+
 export async function fetchUsers(
   limit = 50,
   offset = 0,
@@ -424,6 +445,14 @@ export async function createUser(payload: UserCreateRequest) {
   return data;
 }
 
+export async function bulkCreateUsers(users: BulkUserItem[]) {
+  const { data } = await apiClient.post<BulkUserResponse>(
+    "/v1/admin/users/bulk",
+    { users },
+  );
+  return data;
+}
+
 export async function updateUser(userId: string, payload: UserUpdateRequest) {
   const { data } = await apiClient.put<UserSummary>(
     `/v1/admin/users/${userId}`,