✨ Refactor: Conditionally render OAuth options in login and registration forms

This commit refactors the login and registration forms to enhance user experience by conditionally displaying OAuth-related UI elements.

- In `LoginForm.js` and `RegisterForm.js`:
    - The "Other login/registration options" button and the "or" divider are now only displayed if at least one OAuth provider is enabled in the system settings.
    - This change ensures a cleaner interface when no OAuth options are configured, preventing user confusion.
- In `RegisterForm.js`:
    - Changed `div` class from `relative` to `min-h-screen relative` to ensure the registration form an take up the entire screen height.

web/src/components/auth/PasswordResetForm.js

@@ -76,7 +76,7 @@ const PasswordResetForm = () => {
   }
 
   return (
-    <div className="relative flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8 overflow-hidden">
+    <div className="min-h-screen relative flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8 overflow-hidden">
       {/* 背景图片容器 - 放大并保持居中 */}
       <div
         className="absolute inset-0 z-0 bg-cover bg-center scale-125 opacity-100"