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/CommissionType.js

@@ -0,0 +1,19 @@
+/**
+ * CommissionType Enum
+ * Defines who pays the platform commission
+ * Used in: Property pricing, booking financials
+ */
+const CommissionType = Object.freeze({
+  FROM_OWNER: 'from_owner',
+  FROM_TENANT: 'from_tenant',
+  FROM_BOTH: 'from_both',
+});
+
+// Map type → Arabic label
+const CommissionTypeLabels = Object.freeze({
+  [CommissionType.FROM_OWNER]: 'من المالك',
+  [CommissionType.FROM_TENANT]: 'من المستأجر',
+  [CommissionType.FROM_BOTH]: 'من الاثنين',
+});
+
+export { CommissionType, CommissionTypeLabels };