feat: stabilize admin dashboard, refactor group management, implement PWA, and fix routing

app/server/utils/auth.ts

@@ -1,25 +1,36 @@
 import jwt from 'jsonwebtoken'
 import { H3Event, createError } from 'h3'
 
-const JWT_SECRET = process.env.NUXT_JWT_SECRET || 'your-super-secret-jwt-key'
-
 export interface AuthUser {
   id: string
   email: string
   username: string
+  displayName?: string
   role?: string
 }
 
 export function generateToken(user: AuthUser): string {
+  const config = useRuntimeConfig()
+  const secret = config.jwtSecret || 'your-super-secret-jwt-key'
+  
   return jwt.sign(
-    { id: user.id, email: user.email, username: user.username, role: user.role || 'user' },
-    JWT_SECRET,
+    { 
+      id: user.id, 
+      email: user.email, 
+      username: user.username, 
+      displayName: user.displayName,
+      role: user.role || 'user' 
+    },
+    secret,
     { expiresIn: '7d' }
   )
 }
 
 export function verifyToken(token: string): AuthUser {
-  return jwt.verify(token, JWT_SECRET) as AuthUser
+  const config = useRuntimeConfig()
+  const secret = config.jwtSecret || 'your-super-secret-jwt-key'
+  
+  return jwt.verify(token, secret) as AuthUser
 }
 
 export function getAuthUser(event: H3Event): AuthUser | null {