Add display name support for user management and update related components

server/middleware/auth.js

@@ -14,7 +14,7 @@ export async function authenticateToken(req, res, next) {
   try {
     const decoded = jwt.verify(token, JWT_SECRET);
     const db = getDb();
-    const user = await db.get('SELECT id, name, email, role, theme, language, avatar_color, avatar_image FROM users WHERE id = ?', [decoded.userId]);
+    const user = await db.get('SELECT id, name, display_name, email, role, theme, language, avatar_color, avatar_image FROM users WHERE id = ?', [decoded.userId]);
     if (!user) {
       return res.status(401).json({ error: 'User not found' });
     }