Add enums, AuthService, and integrate backend registration endpoints

- Add separate enum files: BuildingType, PropertyStatus, BookingStatus, CommissionType, IdentityType, UserRole, City, LoginMethod, OwnerType, CustomerType
- Add AuthService (addToken/getToken/deleteToken)
- Update api.js: use AuthService, add Owner/Add and Customer/Add endpoints
- Update login page to use AuthService for token storage
- Rewrite owner register: 3-step flow with OwnerType dropdown, backend integration, OTP verification
- Rewrite tenant register: 2-step flow with CustomerType dropdown, backend integration, OTP verification
- Update homepage and property detail to use enums instead of hardcoded maps
- Update AddPropertyForm to import from enums directly
- Add console logs and status toasts linked to API response messages

app/enums/City.js

@@ -0,0 +1,38 @@
+/**
+ * City Enum
+ * Syrian cities used in property locations
+ * Used in: Property search filters, location display
+ */
+const City = Object.freeze({
+  DAMASCUS: 'دمشق',
+  ALEPPO: 'حلب',
+  HOMS: 'حمص',
+  LATAKIA: 'اللاذقية',
+  DARAA: 'درعا',
+  TARTOUS: 'طرطوس',
+  SUWEIDA: 'السويداء',
+  DEIR_EZZOR: 'دير الزور',
+  RAQQA: 'الرقة',
+  IDLIB: 'إدلب',
+  HASAKAH: 'الحسكة',
+  QAMISHLI: 'القامشلي',
+  RURAL_DAMASCUS: 'ريف دمشق',
+});
+
+// All cities as a flat array
+const CitiesList = Object.freeze(Object.values(City));
+
+/**
+ * Extract city name from a full address string
+ * @param {string} address
+ * @returns {string}
+ */
+function extractCity(address) {
+  if (!address) return '';
+  for (const city of CitiesList) {
+    if (address.includes(city)) return city;
+  }
+  return '';
+}
+
+export { City, CitiesList, extractCity };