fix(admin-v2): Restore complete admin-v2 application

The admin-v2 application was incomplete in the repository. This commit
restores all missing components:

- Admin pages (76 pages): dashboard, ai, compliance, dsgvo, education,
  infrastructure, communication, development, onboarding, rbac
- SDK pages (45 pages): tom, dsfa, vvt, loeschfristen, einwilligungen,
  vendor-compliance, tom-generator, dsr, and more
- Developer portal (25 pages): API docs, SDK guides, frameworks
- All components, lib files, hooks, and types
- Updated package.json with all dependencies

The issue was caused by incomplete initial repository state - the full
admin-v2 codebase existed in backend/admin-v2 and docs-src/admin-v2
but was never fully synced to the main admin-v2 directory.

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

admin-v2/app/api/sdk/v1/demo/clear/route.ts

@@ -0,0 +1,52 @@
+/**
+ * Demo Data Clear API Endpoint
+ *
+ * Clears demo data from the storage (same mechanism as real customer data).
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+// Shared store reference (same as seed endpoint)
+declare global {
+  // eslint-disable-next-line no-var
+  var demoStateStore: Map<string, { state: unknown; version: number; updatedAt: Date }> | undefined
+}
+
+if (!global.demoStateStore) {
+  global.demoStateStore = new Map()
+}
+
+const stateStore = global.demoStateStore
+
+export async function DELETE(request: NextRequest) {
+  try {
+    const body = await request.json()
+    const { tenantId = 'demo-tenant' } = body
+
+    const existed = stateStore.has(tenantId)
+    stateStore.delete(tenantId)
+
+    return NextResponse.json({
+      success: true,
+      message: existed
+        ? `Demo data cleared for tenant ${tenantId}`
+        : `No data found for tenant ${tenantId}`,
+      tenantId,
+      existed,
+    })
+  } catch (error) {
+    console.error('Failed to clear demo data:', error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Unknown error',
+      },
+      { status: 500 }
+    )
+  }
+}
+
+export async function POST(request: NextRequest) {
+  // Also support POST for clearing (for clients that don't support DELETE)
+  return DELETE(request)
+}