feat(founding-wizard): Gründungs-Wizard für 2-Mann GmbH + 14 Notar-Templates

[migration-approved]

Templates (Migrations 123-136):
- 123 GO-GF (Geschäftsordnung Geschäftsführung)
- 124 SHA (Shareholders' Agreement, 56 Platzhalter)
- 125 Satzung (Articles of Association mit UG-Variante)
- 126 GF-Dienstvertrag (Trennungsprinzip Organ/Anstellung)
- 127 Arbeitsvertrag (AGG-neutral, NachwG, eAU)
- 128 Gesellschafterliste (§ 40 GmbHG)
- 129 GF-Bestellungsbeschluss (mit § 6 Abs. 2 Versicherung)
- 130 HRB-Anmeldung (§§ 7, 8, 39 GmbHG, § 12 HGB)
- 131 IP-Assignment Agreement (Gründer→GmbH)
- 132 Term Sheet (Pre-Seed/Seed VC-Standard)
- 133 Wandeldarlehensvertrag (Convertible Loan)
- 134 Beteiligungsvertrag (Subscription Agreement)
- 135 ESOP/VSOP-Plan (3 Varianten)
- 136 Cap Table

Kategorisierung (Migrations 137-138):
- ALTER TABLE compliance_legal_templates ADD lifecycle_stage TEXT[],
  functional_category TEXT (mit CHECK Constraints + GIN-Index)
- Backfill aller 105 Templates: lifecycle_stage (pre_founding|founding|
  startup|kmu|konzern) + functional_category (founding_legal|employment|
  investor_funding|...)

Backend Founding-Wizard Service:
- template_renderer.py: Handlebars-light ({{VAR}}, {{#IF FLAG}}...{{/IF}})
- wizard_to_context.py: Mapping Wizard-State → SCREAMING_SNAKE_CASE Vars
- markdown_to_docx.py: Markdown → DOCX via python-docx
- founding_wizard_routes.py: POST /v1/founding-wizard/generate
  → liefert base64-DOCX-Files für ausgewählte Templates

Frontend Founding-Wizard (/sdk/founding-wizard):
- 8-Step Wizard (Basics, Gesellschafter, GF, Kapital, Notar, SHA, GF-Verträge, Generate)
- useFoundingWizardForm Hook mit localStorage-Persistenz
- TypeScript Code-Registry (template-categories.ts) als Backup zur DB
- Word-Download via data:URLs (base64)

Tests:
- 20 Unit-Tests grün (Renderer, Context-Mapping, DOCX-Conversion)
- Playwright E2E-Test mit 2-Mann GmbH (Benjamin + Sharang) Test-Daten

admin-compliance/app/api/v1/founding-wizard/generate/route.ts

@@ -0,0 +1,58 @@
+/**
+ * Next.js Proxy: leitet POST /api/v1/founding-wizard/generate an Backend.
+ *
+ * Konvertiert das Backend-Response (base64 DOCX) in data: URLs,
+ * die das Frontend direkt als Download anbieten kann.
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+
+const BACKEND_URL = process.env.BACKEND_COMPLIANCE_URL || 'http://bp-compliance-backend:8002'
+
+export async function POST(req: NextRequest) {
+  try {
+    const body = await req.json()
+
+    const backendRes = await fetch(`${BACKEND_URL}/v1/founding-wizard/generate`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(body),
+    })
+
+    if (!backendRes.ok) {
+      const errorText = await backendRes.text()
+      return NextResponse.json(
+        { error: 'Backend-Generierung fehlgeschlagen', detail: errorText },
+        { status: backendRes.status }
+      )
+    }
+
+    const data = await backendRes.json()
+    const documents = (data.documents || []).map((doc: {
+      document_type: string
+      title: string
+      filename: string
+      content_base64: string
+      size_bytes: number
+      generated_at: string
+    }) => ({
+      document_type: doc.document_type,
+      title: doc.title,
+      filename: doc.filename,
+      download_url: `data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,${doc.content_base64}`,
+      size_bytes: doc.size_bytes,
+      generated_at: doc.generated_at,
+    }))
+
+    return NextResponse.json({
+      documents,
+      warnings: data.warnings || [],
+    })
+  } catch (e: unknown) {
+    const message = e instanceof Error ? e.message : 'Unbekannter Fehler'
+    return NextResponse.json(
+      { error: 'Proxy-Fehler', detail: message },
+      { status: 500 }
+    )
+  }
+}