feat: AI Act Decision Tree — Zwei-Achsen-Klassifikation (GPAI + High-Risk)

Interaktiver 12-Fragen-Entscheidungsbaum für die AI Act Klassifikation
auf zwei Achsen: High-Risk (Anhang III, Q1-Q7) und GPAI (Art. 51-56, Q8-Q12).
Deterministische Auswertung ohne LLM.

Backend (Go):
- Neue Structs: GPAIClassification, DecisionTreeAnswer, DecisionTreeResult
- Decision Tree Engine mit BuildDecisionTreeDefinition() und EvaluateDecisionTree()
- Store-Methoden für CRUD der Ergebnisse
- API-Endpoints: GET/POST /decision-tree, GET/DELETE /decision-tree/results
- 12 Unit Tests (alle bestanden)

Frontend (Next.js):
- DecisionTreeWizard: Wizard-UI mit Ja/Nein-Fragen, Dual-Progress-Bar, Ergebnis-Ansicht
- AI Act Page refactored: Tabs (Übersicht | Entscheidungsbaum | Ergebnisse)
- Proxy-Route für decision-tree Endpoints

Migration 083: ai_act_decision_tree_results Tabelle

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

admin-compliance/app/api/sdk/v1/ucca/decision-tree/[[...path]]/route.ts

@@ -0,0 +1,57 @@
+import { NextRequest, NextResponse } from 'next/server'
+
+const SDK_URL = process.env.SDK_URL || 'http://ai-compliance-sdk:8090'
+const DEFAULT_TENANT = process.env.DEFAULT_TENANT_ID || '9282a473-5c95-4b3a-bf78-0ecc0ec71d3e'
+
+/**
+ * Proxy: /api/sdk/v1/ucca/decision-tree/... → Go Backend /sdk/v1/ucca/decision-tree/...
+ */
+async function proxyRequest(request: NextRequest, { params }: { params: Promise<{ path: string[] }> }) {
+  const { path } = await params
+  const subPath = path ? path.join('/') : ''
+  const search = request.nextUrl.search || ''
+  const targetUrl = `${SDK_URL}/sdk/v1/ucca/decision-tree/${subPath}${search}`
+
+  const tenantID = request.headers.get('X-Tenant-ID') || DEFAULT_TENANT
+
+  try {
+    const headers: Record<string, string> = {
+      'X-Tenant-ID': tenantID,
+    }
+
+    const fetchOptions: RequestInit = {
+      method: request.method,
+      headers,
+    }
+
+    if (request.method === 'POST' || request.method === 'PUT' || request.method === 'PATCH') {
+      const body = await request.json()
+      headers['Content-Type'] = 'application/json'
+      fetchOptions.body = JSON.stringify(body)
+    }
+
+    const response = await fetch(targetUrl, fetchOptions)
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      console.error(`Decision tree proxy error [${request.method} ${subPath}]:`, errorText)
+      return NextResponse.json(
+        { error: 'Backend error', details: errorText },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data, { status: response.status })
+  } catch (error) {
+    console.error('Decision tree proxy connection error:', error)
+    return NextResponse.json(
+      { error: 'Failed to connect to AI compliance backend' },
+      { status: 503 }
+    )
+  }
+}
+
+export const GET = proxyRequest
+export const POST = proxyRequest
+export const DELETE = proxyRequest

admin-compliance/app/api/sdk/v1/ucca/decision-tree/route.ts

@@ -0,0 +1,36 @@
+import { NextRequest, NextResponse } from 'next/server'
+
+const SDK_URL = process.env.SDK_URL || 'http://ai-compliance-sdk:8090'
+const DEFAULT_TENANT = process.env.DEFAULT_TENANT_ID || '9282a473-5c95-4b3a-bf78-0ecc0ec71d3e'
+
+/**
+ * Proxy: GET /api/sdk/v1/ucca/decision-tree → Go Backend GET /sdk/v1/ucca/decision-tree
+ * Returns the decision tree definition (questions, structure)
+ */
+export async function GET(request: NextRequest) {
+  const tenantID = request.headers.get('X-Tenant-ID') || DEFAULT_TENANT
+
+  try {
+    const response = await fetch(`${SDK_URL}/sdk/v1/ucca/decision-tree`, {
+      headers: { 'X-Tenant-ID': tenantID },
+    })
+
+    if (!response.ok) {
+      const errorText = await response.text()
+      console.error('Decision tree GET error:', errorText)
+      return NextResponse.json(
+        { error: 'Backend error', details: errorText },
+        { status: response.status }
+      )
+    }
+
+    const data = await response.json()
+    return NextResponse.json(data)
+  } catch (error) {
+    console.error('Decision tree proxy error:', error)
+    return NextResponse.json(
+      { error: 'Failed to connect to AI compliance backend' },
+      { status: 503 }
+    )
+  }
+}