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/tests/[...path]/route.ts

@@ -0,0 +1,75 @@
+/**
+ * Test Registry API Proxy
+ *
+ * Leitet Anfragen an das Python-Backend (Port 8000) weiter.
+ * Vermeidet CORS-Probleme und ermoeglicht Server-Side Rendering.
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:8000'
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ path: string[] }> }
+) {
+  const { path } = await params
+  const pathStr = path.join('/')
+  const url = new URL(request.url)
+  const queryString = url.search
+
+  try {
+    const response = await fetch(`${BACKEND_URL}/api/tests/${pathStr}${queryString}`, {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    })
+
+    const data = await response.json()
+    return NextResponse.json(data, { status: response.status })
+  } catch (error) {
+    console.error('Test Registry API proxy error:', error)
+    return NextResponse.json(
+      { error: 'Backend nicht erreichbar', demo: true },
+      { status: 503 }
+    )
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ path: string[] }> }
+) {
+  const { path } = await params
+  const pathStr = path.join('/')
+
+  try {
+    let body = null
+    const contentType = request.headers.get('content-type')
+    if (contentType?.includes('application/json')) {
+      try {
+        body = await request.json()
+      } catch {
+        // Empty body is OK for some endpoints
+      }
+    }
+
+    const response = await fetch(`${BACKEND_URL}/api/tests/${pathStr}`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: body ? JSON.stringify(body) : undefined,
+    })
+
+    const data = await response.json()
+    return NextResponse.json(data, { status: response.status })
+  } catch (error) {
+    console.error('Test Registry API proxy error:', error)
+    return NextResponse.json(
+      { error: 'Backend nicht erreichbar', demo: true },
+      { status: 503 }
+    )
+  }
+}