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/IdentityType.js

@@ -0,0 +1,23 @@
+/**
+ * IdentityType Enum
+ * Tenant identity document type
+ * Used in: Property booking, allowedIdentities filter
+ */
+const IdentityType = Object.freeze({
+  SYRIAN: 'syrian',
+  PASSPORT: 'passport',
+});
+
+// Map type → Arabic label
+const IdentityTypeLabels = Object.freeze({
+  [IdentityType.SYRIAN]: 'هوية سورية',
+  [IdentityType.PASSPORT]: 'جواز سفر',
+});
+
+// Map type → flag emoji
+const IdentityTypeFlags = Object.freeze({
+  [IdentityType.SYRIAN]: '🇸🇾',
+  [IdentityType.PASSPORT]: '🛂',
+});
+
+export { IdentityType, IdentityTypeLabels, IdentityTypeFlags };