Fix registration 415: send multipart form data with ID images

- addCustomer/addOwner now use FormData with multipart upload
- Front and back ID images appended as FrontIdCarImage/RearIdCarImage
- Registration pages pass idImages.front and idImages.back to API
- Field names mapped to PascalCase for .NET API (FullName, Email, etc.)

app/utils/api.js

@@ -160,19 +160,63 @@ export async function getTerms() {
  * @param {Object} data — { name, email, phoneNumber, whatsAppNumber, password, ownerType }
  * @returns {Promise<{status, data, ok, message}>}
  */
-export async function addOwner(data) {
-  console.log('[Auth] Registering owner:', data.email);
-  return authFetch('/Owner/Add', data);
+// Multipart form-data fetch for file uploads
+async function multipartAuthFetch(endpoint, formData) {
+  console.log('[Auth] Multipart request:', `${API_BASE}${endpoint}`);
+
+  const res = await fetch(`${API_BASE}${endpoint}`, {
+    method: 'POST',
+    // Don't set Content-Type — browser sets it with boundary
+    body: formData,
+  });
+
+  console.log('[Auth] Response status:', res.status, endpoint);
+
+  const text = await res.text();
+  let data = null;
+  try {
+    data = text ? JSON.parse(text) : null;
+    if (data && typeof data === 'object' && 'data' in data) {
+      data = data.data;
+    }
+  } catch {
+    data = text;
+  }
+
+  return { status: res.status, data, ok: res.ok || res.status === 206, message: data?.message };
 }
 
-/**
- * Register a new customer/tenant
- * @param {Object} data — { name, email, phoneNumber, password, customerType }
- * @returns {Promise<{status, data, ok, message}>}
- */
-export async function addCustomer(data) {
-  console.log('[Auth] Registering customer:', data.email);
-  return authFetch('/Customer/Add', data);
+export async function addOwner(data, frontImage = null, backImage = null) {
+  console.log('[Auth] Registering owner (multipart):', data.email);
+
+  const formData = new FormData();
+  formData.append('FullName', data.name || data.FullName || '');
+  formData.append('Email', data.email || '');
+  formData.append('PhoneNumber', data.phoneNumber || '');
+  formData.append('WhatsAppNumber', data.whatsAppNumber || '');
+  formData.append('Password', data.password || '');
+  formData.append('Type', String(data.ownerType ?? data.Type ?? 0));
+
+  if (frontImage) formData.append('FrontIdCarImage', frontImage);
+  if (backImage) formData.append('RearIdCarImage', backImage);
+
+  return multipartAuthFetch('/Owner/Add', formData);
+}
+
+export async function addCustomer(data, frontImage = null, backImage = null) {
+  console.log('[Auth] Registering customer (multipart):', data.email);
+
+  const formData = new FormData();
+  formData.append('FullName', data.name || data.FullName || '');
+  formData.append('Email', data.email || '');
+  formData.append('PhoneNumber', data.phoneNumber || '');
+  formData.append('Password', data.password || '');
+  formData.append('Type', String(data.customerType ?? data.Type ?? 0));
+
+  if (frontImage) formData.append('FrontIdCarImage', frontImage);
+  if (backImage) formData.append('RearIdCarImage', backImage);
+
+  return multipartAuthFetch('/Customer/Add', formData);
 }
 
 // ─── Auth: Login ───