refactor: Entwicklung-Kategorie aus Core Admin entfernt

Screen Flow, Brandbook und Developer Docs waren veraltet und werden nicht mehr benoetigt.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-core/lib/navigation.ts

@@ -4,7 +4,7 @@
  * 3 Categories: Communication, Infrastructure, Development
  */
 
-export type CategoryId = 'infrastructure' | 'development'
+export type CategoryId = 'infrastructure'
 
 export interface NavModule {
   id: string
@@ -94,43 +94,6 @@ export const navigation: NavCategory[] = [
       },
     ],
   },
-  // =========================================================================
-  // Entwicklung (Slate)
-  // =========================================================================
-  {
-    id: 'development',
-    name: 'Entwicklung',
-    icon: 'code',
-    color: '#64748b',
-    colorClass: 'development',
-    description: 'Docs, Screen Flow & Brandbook',
-    modules: [
-      {
-        id: 'docs',
-        name: 'Developer Docs',
-        href: '/development/docs',
-        description: 'MkDocs Dokumentation',
-        purpose: 'API-Dokumentation und Architektur-Diagramme durchsuchen.',
-        audience: ['Entwickler'],
-      },
-      {
-        id: 'screen-flow',
-        name: 'Screen Flow',
-        href: '/development/screen-flow',
-        description: 'UI Screen-Verbindungen',
-        purpose: 'Navigation und Screen-Verbindungen der Core-App visualisieren.',
-        audience: ['Designer', 'Entwickler'],
-      },
-      {
-        id: 'brandbook',
-        name: 'Brandbook',
-        href: '/development/brandbook',
-        description: 'Corporate Design',
-        purpose: 'Referenz fuer Logos, Farben, Typografie und Design-Richtlinien.',
-        audience: ['Designer', 'Marketing'],
-      },
-    ],
-  },
 ]
 
 // Meta modules (always visible)