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/admin/middleware/route.ts

@@ -0,0 +1,59 @@
+/**
+ * Middleware Admin API Proxy - Base route
+ * GET /api/admin/middleware -> GET all middleware configs
+ * Forwards authentication cookies for session-based auth
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.BACKEND_URL || 'http://localhost:8000'
+
+function getForwardHeaders(request: NextRequest): HeadersInit {
+  const headers: HeadersInit = {
+    'Content-Type': 'application/json',
+  }
+
+  // Forward cookie for session auth
+  const cookie = request.headers.get('cookie')
+  if (cookie) {
+    headers['Cookie'] = cookie
+  }
+
+  // Forward authorization header if present
+  const auth = request.headers.get('authorization')
+  if (auth) {
+    headers['Authorization'] = auth
+  }
+
+  return headers
+}
+
+export async function GET(request: NextRequest) {
+  const searchParams = request.nextUrl.searchParams.toString()
+  const url = `${BACKEND_URL}/api/admin/middleware${searchParams ? `?${searchParams}` : ''}`
+
+  try {
+    const response = await fetch(url, {
+      method: 'GET',
+      headers: getForwardHeaders(request),
+      signal: AbortSignal.timeout(30000)
+    })
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      return NextResponse.json(
+        { error: `Backend Error: ${response.status}`, details: errorText },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Middleware API proxy error:', error)
+    return NextResponse.json(
+      { error: 'Verbindung zum Backend fehlgeschlagen' },
+      { status: 503 }
+    )
+  }
+}