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/UserRole.js

@@ -0,0 +1,26 @@
+/**
+ * UserRole Enum
+ * User account roles in the system
+ * Used in: JWT payload, registration, routing
+ */
+const UserRole = Object.freeze({
+  OWNER: 'owner',
+  TENANT: 'tenant',
+  ADMIN: 'admin',
+});
+
+// Map role → Arabic label
+const UserRoleLabels = Object.freeze({
+  [UserRole.OWNER]: 'مالك عقار',
+  [UserRole.TENANT]: 'مستأجر',
+  [UserRole.ADMIN]: 'مدير النظام',
+});
+
+// Map role → color theme (used in UI)
+const UserRoleColors = Object.freeze({
+  [UserRole.OWNER]: 'amber',
+  [UserRole.TENANT]: 'blue',
+  [UserRole.ADMIN]: 'red',
+});
+
+export { UserRole, UserRoleLabels, UserRoleColors };