feat: add settings data upload and single-name user forms

Allow SuperAdmins to upload import JSON from settings, and update user UI for merged name, gender, and extended profile fields.

src/views/payments/PaymentListView.vue

@@ -22,7 +22,7 @@
       <Column field="user" header="نام دانشجو / کاربر">
         <template #body="{ data }">
           <router-link :to="`/payments/view/${data._id || data.id}`" class="font-bold text-color hover:text-primary">
-            {{ data.user?.name || data.userName || 'کاربر' }} {{ data.user?.surname || '' }}
+            {{ data.user?.name || data.userName || 'کاربر' }}
           </router-link>
         </template>
       </Column>
@@ -196,7 +196,7 @@ const fetchDropdownData = async () => {
     ]);
     const uData = uRes.data || uRes;
     const rawUsers = uData.items || uData.users || uData || [];
-    usersList.value = rawUsers.map(u => ({ ...u, fullName: `${u.name} ${u.surname}` }));
+    usersList.value = rawUsers.map(u => ({ ...u, fullName: u.name || '' }));
 
     const cData = cRes.data || cRes;
     classesList.value = cData.items || cData.classes || cData || [];