feat(vendor-assessment): Pruefprotokoll + Frontend + Sidebar

Phase 4-5: Professional Pruefprotokoll report builder with styled HTML
output (Kopfdaten, Kategorie-Scores, L1/L2 Check-Hierarchie, Findings,
Freigabe-Block). Frontend at /sdk/vendor-assessment with 3-step flow:
DocumentUploader → AssessmentProgress → PruefprotokollView.

Sidebar: "Use-Case Audits" → "Vertragspruefung" renamed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/api/vendor-compliance/assessments/[id]/route.ts

@@ -0,0 +1,53 @@
+/**
+ * Vendor Assessment Status/Detail Proxy
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.COMPLIANCE_BACKEND_URL || 'http://backend-compliance:8002'
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const { id } = await params
+  try {
+    const resp = await fetch(
+      `${BACKEND_URL}/api/vendor-compliance/assessments/${id}`,
+      { signal: AbortSignal.timeout(10000) },
+    )
+    const data = await resp.json()
+    return NextResponse.json(data, { status: resp.status })
+  } catch (error) {
+    console.error('Assessment status proxy error:', error)
+    return NextResponse.json(
+      { error: 'Backend nicht erreichbar' },
+      { status: 503 },
+    )
+  }
+}
+
+export async function POST(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const { id } = await params
+  try {
+    const resp = await fetch(
+      `${BACKEND_URL}/api/vendor-compliance/assessments/${id}/approve`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        signal: AbortSignal.timeout(10000),
+      },
+    )
+    const data = await resp.json()
+    return NextResponse.json(data, { status: resp.status })
+  } catch (error) {
+    console.error('Assessment approve proxy error:', error)
+    return NextResponse.json(
+      { error: 'Backend nicht erreichbar' },
+      { status: 503 },
+    )
+  }
+}

admin-compliance/app/api/vendor-compliance/assessments/route.ts

@@ -0,0 +1,41 @@
+/**
+ * Vendor Assessment API Proxy
+ * Proxies to backend-compliance (Python FastAPI)
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.COMPLIANCE_BACKEND_URL || 'http://backend-compliance:8002'
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.text()
+    const resp = await fetch(`${BACKEND_URL}/api/vendor-compliance/assessments`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body,
+      signal: AbortSignal.timeout(10000),
+    })
+    const data = await resp.json()
+    return NextResponse.json(data, { status: resp.status })
+  } catch (error) {
+    console.error('Vendor assessment proxy error:', error)
+    return NextResponse.json(
+      { error: 'Backend nicht erreichbar' },
+      { status: 503 },
+    )
+  }
+}
+
+export async function GET() {
+  try {
+    const resp = await fetch(`${BACKEND_URL}/api/vendor-compliance/assessments`, {
+      signal: AbortSignal.timeout(10000),
+    })
+    const data = await resp.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Vendor assessment list proxy error:', error)
+    return NextResponse.json({ assessments: [] })
+  }
+}