feat(cra): CRA Readiness Check lead-magnet on /sdk/cra (Track A)

Low-friction, stateless readiness check (no project/DB): business-scope answers
(internet / parameter app / remote maintenance / updates / firmware / personal
data / critical infra) -> Annex III/IV classification (reuses _classify) + a
high-level guideline grouped Code / Prozess / Dokumentation (via Annex I
evidence_type) + conformity path + deadlines + rough effort + the "we implement"
hook and a CTA into the existing project workflow. Endpoint POST /api/v1/cra/
readiness. Reuse + reframe of the existing CRA module — no duplicate questionnaire.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

admin-compliance/app/sdk/cra/page.tsx

@@ -3,6 +3,7 @@
 import React, { useState, useEffect, useCallback } from 'react'
 import { useRouter } from 'next/navigation'
 import { ClassificationBadge } from './_components/ClassificationBadge'
+import { ReadinessCheck } from './_components/ReadinessCheck'
 
 interface CRAProject {
   id: string
@@ -99,6 +100,8 @@ export default function CRAProjectsPage() {
           </p>
         </div>
 
+        <ReadinessCheck onCreateProject={() => setShowModal(true)} />
+
         <div className="mb-4 px-4 py-2 bg-emerald-50 border border-emerald-200 rounded-lg text-xs text-emerald-800 flex items-start gap-2">
           <span className="font-semibold">Quellen &amp; Lizenz:</span>
           <span>