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/BuildingType.js

@@ -0,0 +1,33 @@
+/**
+ * BuildingType Enum
+ * Backend values are numeric (0, 1, 2)
+ * Used in: PropertyInformation.buildingType
+ */
+const BuildingType = Object.freeze({
+  APARTMENT: 0,
+  VILLA: 1,
+  HOUSE: 2,
+});
+
+// Map numeric value → Arabic label
+const BuildingTypeLabels = Object.freeze({
+  [BuildingType.APARTMENT]: 'شقة',
+  [BuildingType.VILLA]: 'فيلا',
+  [BuildingType.HOUSE]: 'بيت',
+});
+
+// Map numeric value → English key (for UI filters)
+const BuildingTypeKeys = Object.freeze({
+  [BuildingType.APARTMENT]: 'apartment',
+  [BuildingType.VILLA]: 'villa',
+  [BuildingType.HOUSE]: 'house',
+});
+
+// Reverse map: English key → numeric value
+const BuildingTypeByKey = Object.freeze({
+  apartment: BuildingType.APARTMENT,
+  villa: BuildingType.VILLA,
+  house: BuildingType.HOUSE,
+});
+
+export { BuildingType, BuildingTypeLabels, BuildingTypeKeys, BuildingTypeByKey };