Add OpenTTD and Terraria support, improve config editors

- Add OpenTTD server integration (config editor, server card, API)
- Add Terraria server integration (config editor, API)
- Add legends to all config editors for syntax highlighting
- Simplify UserManagement: remove edit/delete buttons, add Discord avatars
- Add auto-logout on 401/403 API errors
- Update save button styling with visible borders

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

gsm-frontend/src/pages/Dashboard.jsx

@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react'
 import { useNavigate } from 'react-router-dom'
-import { getServers } from '../api'
+import { getServers, getAllDisplaySettings } from '../api'
 import { useUser } from '../context/UserContext'
 import ServerCard from '../components/ServerCard'
 import UserManagement from '../components/UserManagement'
@@ -11,6 +11,7 @@ export default function Dashboard({ onLogin, onLogout }) {
   const navigate = useNavigate()
   const { user, token, loading: userLoading, isSuperadmin, role } = useUser()
   const [servers, setServers] = useState([])
+  const [displaySettings, setDisplaySettings] = useState({})
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState('')
   const [showUserMgmt, setShowUserMgmt] = useState(false)
@@ -22,8 +23,12 @@ export default function Dashboard({ onLogin, onLogout }) {
 
   const fetchServers = async () => {
     try {
-      const data = await getServers(token)
+      const [data, settings] = await Promise.all([
+        getServers(token),
+        getAllDisplaySettings(token)
+      ])
       setServers(data)
+      setDisplaySettings(settings)
       setError('')
     } catch (err) {
       if (err.message.includes('401') || err.message.includes('403')) {
@@ -225,6 +230,7 @@ export default function Dashboard({ onLogin, onLogout }) {
                   server={server}
                   onClick={() => navigate('/server/' + server.id)}
                   isAuthenticated={isAuthenticated}
+                  displaySettings={displaySettings[server.id]}
                 />
               </div>
             ))}