feat(auth): implement password reset functionality

- Added new endpoints for requesting and resetting passwords in the authController.
- Updated User model to include resetToken and resetTokenExpires fields for managing password reset requests.
- Enhanced emailService to send password reset emails with secure links.
- Updated frontend routes and views to support password reset flow, including new ForgotPassword and ResetPassword components.
- Improved internationalization files with new translation keys for password reset messages across multiple languages.

backend/models/User.js

@@ -37,6 +37,16 @@ const User = sequelize.define('User', {
   authCode: {
     type: DataTypes.STRING,
     allowNull: true
+  },
+  resetToken: {
+    type: DataTypes.STRING,
+    allowNull: true,
+    comment: 'Token für Passwort-Reset'
+  },
+  resetTokenExpires: {
+    type: DataTypes.DATE,
+    allowNull: true,
+    comment: 'Ablaufzeitpunkt des Reset-Tokens'
   }
 }, {
   underscored: true,