feat: Architektur-Uebersichtsseite — interaktiver Service-Graph mit ReactFlow

13 Services in 4 Schwimmbahnen (Frontend, Backend, Infrastructure, Data Sovereignty),
Layer-Filter, DB/RAG/API-Toggles, Detail-Panel und Service-Tabelle.

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

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

@@ -578,6 +578,18 @@ export function SDKSidebar({ collapsed = false, onCollapsedChange }: SDKSidebarP
             isActive={pathname === '/sdk/sdk-flow'}
             collapsed={collapsed}
           />
+          <AdditionalModuleItem
+            href="/sdk/architecture"
+            icon={
+              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+                  d="M5 12h14M5 12a2 2 0 01-2-2V6a2 2 0 012-2h14a2 2 0 012 2v4a2 2 0 01-2 2M5 12a2 2 0 00-2 2v4a2 2 0 002 2h14a2 2 0 002-2v-4a2 2 0 00-2-2m-2-4h.01M17 16h.01" />
+              </svg>
+            }
+            label="Architektur"
+            isActive={pathname === '/sdk/architecture'}
+            collapsed={collapsed}
+          />
           <AdditionalModuleItem
             href="https://macmini:3006"
             icon={