feat: Implement Compliance Academy E-Learning module (Phases 1-7)

Add complete Academy backend (Go) and frontend (Next.js) for DSGVO/IT-Security/AI-Literacy compliance training:
- Go backend: Course CRUD, enrollments, quiz evaluation, PDF certificates (gofpdf), video generation pipeline (ElevenLabs + HeyGen)
- In-memory data store with PostgreSQL migration for future DB support
- Frontend: Course creation (AI + manual), lesson viewer, interactive quiz, certificate viewer with PDF download
- Fix existing compile errors in generate.go (SearchResult type mismatch), llm/service.go (unused var), rag/service.go (Unicode chars)

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

admin-v2/components/sdk/academy/CertificateViewer.tsx

@@ -0,0 +1,141 @@
+'use client'
+
+import { useState } from 'react'
+import { Certificate } from '@/lib/sdk/academy/types'
+import { downloadCertificatePDF } from '@/lib/sdk/academy/api'
+
+interface CertificateViewerProps {
+  certificate: Certificate
+  onClose?: () => void
+}
+
+export default function CertificateViewer({ certificate, onClose }: CertificateViewerProps) {
+  const [downloading, setDownloading] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  const handleDownloadPDF = async () => {
+    setDownloading(true)
+    setError(null)
+    try {
+      const blob = await downloadCertificatePDF(certificate.id)
+      const url = window.URL.createObjectURL(blob)
+      const a = document.createElement('a')
+      a.href = url
+      a.download = `zertifikat-${certificate.id.slice(0, 8)}.pdf`
+      document.body.appendChild(a)
+      a.click()
+      document.body.removeChild(a)
+      window.URL.revokeObjectURL(url)
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'PDF-Download fehlgeschlagen')
+    } finally {
+      setDownloading(false)
+    }
+  }
+
+  const issuedDate = new Date(certificate.issuedAt).toLocaleDateString('de-DE', {
+    day: '2-digit', month: '2-digit', year: 'numeric'
+  })
+  const validDate = new Date(certificate.validUntil).toLocaleDateString('de-DE', {
+    day: '2-digit', month: '2-digit', year: 'numeric'
+  })
+  const isExpired = new Date(certificate.validUntil) < new Date()
+
+  return (
+    <div className="bg-white border border-gray-200 rounded-xl shadow-lg overflow-hidden">
+      {/* Certificate Preview */}
+      <div className="relative bg-gradient-to-br from-indigo-50 via-white to-purple-50 p-8">
+        {/* Decorative border */}
+        <div className="absolute inset-4 border-2 border-indigo-200 rounded-lg pointer-events-none" />
+        <div className="absolute inset-5 border border-indigo-100 rounded-lg pointer-events-none" />
+
+        <div className="relative text-center space-y-4">
+          {/* Company */}
+          <p className="text-sm text-gray-400 tracking-widest uppercase">BreakPilot Compliance</p>
+
+          {/* Title */}
+          <h2 className="text-2xl font-bold text-gray-900 tracking-wide">SCHULUNGSZERTIFIKAT</h2>
+
+          {/* Decorative line */}
+          <div className="mx-auto w-24 h-0.5 bg-indigo-500" />
+
+          {/* Body */}
+          <p className="text-sm text-gray-500">Hiermit wird bescheinigt, dass</p>
+
+          <p className="text-xl font-bold text-gray-900">{certificate.userName}</p>
+
+          <p className="text-sm text-gray-500">die folgende Compliance-Schulung erfolgreich abgeschlossen hat:</p>
+
+          <p className="text-lg font-semibold text-indigo-600">{certificate.courseName}</p>
+
+          {/* Score */}
+          {certificate.score > 0 && (
+            <p className="text-sm text-gray-500">
+              Testergebnis: <span className="font-semibold text-gray-700">{certificate.score}%</span>
+            </p>
+          )}
+
+          {/* Dates */}
+          <div className="flex justify-between items-center px-8 pt-4 text-xs text-gray-400">
+            <span>Abschlussdatum: {issuedDate}</span>
+            <span className={isExpired ? 'text-red-500 font-medium' : ''}>
+              Gueltig bis: {validDate}
+              {isExpired && ' (abgelaufen)'}
+            </span>
+          </div>
+
+          {/* Certificate ID */}
+          <p className="text-xs text-gray-300">
+            Zertifikats-Nr.: {certificate.id.slice(0, 12)}
+          </p>
+        </div>
+      </div>
+
+      {/* Actions */}
+      <div className="px-6 py-4 bg-gray-50 border-t border-gray-200 flex items-center justify-between">
+        <div className="text-xs text-gray-400">
+          Elektronisch erstellt - ohne Unterschrift gueltig
+        </div>
+        <div className="flex gap-3">
+          {onClose && (
+            <button
+              onClick={onClose}
+              className="px-4 py-2 text-sm text-gray-600 hover:text-gray-800 transition-colors"
+            >
+              Schliessen
+            </button>
+          )}
+          <button
+            onClick={handleDownloadPDF}
+            disabled={downloading}
+            className="px-4 py-2 text-sm font-medium text-white bg-indigo-600 hover:bg-indigo-700 disabled:bg-indigo-400 rounded-lg transition-colors flex items-center gap-2"
+          >
+            {downloading ? (
+              <>
+                <svg className="animate-spin h-4 w-4" viewBox="0 0 24 24">
+                  <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" fill="none" />
+                  <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
+                </svg>
+                Wird erstellt...
+              </>
+            ) : (
+              <>
+                <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+                </svg>
+                PDF herunterladen
+              </>
+            )}
+          </button>
+        </div>
+      </div>
+
+      {/* Error */}
+      {error && (
+        <div className="px-6 py-3 bg-red-50 border-t border-red-200 text-sm text-red-600">
+          {error}
+        </div>
+      )}
+    </div>
+  )
+}