feat(ui): clean settings duplicates, move agents to start page, remove from topbar dropdown

frontend/src/pages/Settings.tsx

@@ -44,8 +44,11 @@ export function SettingsPage() {
   ];
 
   const existingPaths = new Set(hardcodedNavItems.map(item => item.to));
+  // Filter out plugin nav items that are duplicates of hardcoded ones
+  const duplicateLabels = new Set(['Roles', 'Users', 'Groups', 'AI Settings', 'Automation', 'Proactive AI']);
   const pluginNavItems = pluginSettingsPages
     .filter(p => !existingPaths.has(`/settings/${p.path}`))
+    .filter(p => !duplicateLabels.has(p.label))
     .map(p => ({
       to: `/settings/${p.path}`,
       label: t(p.label_key, p.label),

frontend/src/pages/StartPage.tsx

@@ -8,7 +8,7 @@ import { useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
 import { useAuthStore } from '@/store/authStore';
 import { useUIStore } from '@/store/uiStore';
-import { Settings, HelpCircle, LayoutGrid, ArrowRight, Plus } from 'lucide-react';
+import { Settings, HelpCircle, LayoutGrid, ArrowRight, Plus, Bot } from 'lucide-react';
 
 // Workspace tile definition
 interface WorkspaceTile {
@@ -40,6 +40,7 @@ export function StartPage() {
   const menuItems = [
     { id: 'workspaces', label: 'Workspaces', icon: <LayoutGrid className="w-4 h-4" />, active: true },
     { id: 'settings', label: 'Einstellungen', icon: <Settings className="w-4 h-4" />, onClick: () => navigate('/settings') },
+    { id: 'agents', label: 'Agenten', icon: <Bot className="w-4 h-4" />, onClick: () => navigate('/agents') },
     { id: 'help', label: 'Hilfe', icon: <HelpCircle className="w-4 h-4" />, onClick: () => navigate('/help/welcome') },
   ];