refactor: Admin-Layout komplett entfernt — SDK als einziges Layout

Kaputtes (admin) Layout geloescht (Role-Selection, 404-Sidebar, localhost-Dashboard).
SDK-Flow nach /sdk/sdk-flow verschoben. Route-Gruppe (sdk) aufgeloest.
Root-Seite redirected auf /sdk. ~25 ungenutzte Dateien/Verzeichnisse entfernt.

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

admin-compliance/components/sdk/Sidebar/SDKSidebar.tsx

@@ -552,7 +552,7 @@ export function SDKSidebar({ collapsed = false, onCollapsedChange }: SDKSidebarP
             collapsed={collapsed}
           />
           <AdditionalModuleItem
-            href="/development/sdk-flow"
+            href="/sdk/sdk-flow"
             icon={
               <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
@@ -560,7 +560,7 @@ export function SDKSidebar({ collapsed = false, onCollapsedChange }: SDKSidebarP
               </svg>
             }
             label="SDK Flow"
-            isActive={pathname === '/development/sdk-flow'}
+            isActive={pathname === '/sdk/sdk-flow'}
             collapsed={collapsed}
           />
           {state.companyProfile?.machineBuilder?.ceMarkingRequired && (