fix: AWS SES configuration and email verification flow

Changes:
- Updated AWS_REGION to eu-central-1 in env examples
- Fixed email verification to return new JWT token with updated emailVerified status
- Added updateUser function to AuthContext for token refresh
- Updated frontend to save new token after email verification
- Fixed variable naming conflict (token vs jwtToken) in verification endpoints
- Changed WSDC ID placeholder from 26997 to 12345

This ensures the verification banner disappears immediately after
email verification without requiring re-login.

frontend/src/contexts/AuthContext.jsx

@@ -65,12 +65,18 @@ export const AuthProvider = ({ children }) => {
     setUser(null);
   };
 
+  const updateUser = (userData) => {
+    setUser(userData);
+    localStorage.setItem('user', JSON.stringify(userData));
+  };
+
   const value = {
     user,
     loading,
     login,
     register,
     logout,
+    updateUser,
     isAuthenticated: !!user,
   };