fix(pitch-deck): GESAMTUMSATZ sum, Engineering stats, betriebliche accordion

- Fix GESAMTUMSATZ: only sum section='revenue' rows (not price/quantity)
- Fix Materialaufwand SUMME: only sum section='cost' rows
- Kunden GESAMT: trust DB values instead of wrong frontend recompute
- Engineering: 500K+ LoC, 385 RAG docs, 25K+ controls, remove modules card
- Betriebliche Aufwendungen: clickable category headers with ▸/▾ toggle

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

pitch-deck/components/slides/EngineeringSlide.tsx

@@ -30,33 +30,26 @@ export default function EngineeringSlide({ lang }: EngineeringSlideProps) {
 
   const heroStats = [
     {
-      value: '481K',
+      value: '500K+',
       label: de ? 'Zeilen Code' : 'Lines of Code',
       sub: 'Go · Python · TypeScript',
       color: 'text-indigo-400',
       borderColor: 'border-indigo-500/30',
     },
     {
-      value: '320',
+      value: '385',
       label: de ? 'Dokumente im RAG' : 'Documents in RAG',
       sub: de ? 'EU · DACH · Frameworks · Urteile' : 'EU · DACH · Frameworks · Rulings',
       color: 'text-emerald-400',
       borderColor: 'border-emerald-500/30',
     },
     {
-      value: '70K+',
+      value: '25K+',
       label: de ? 'Compliance Controls' : 'Compliance Controls',
       sub: de ? '6 Pipeline-Versionen' : '6 pipeline versions',
       color: 'text-purple-400',
       borderColor: 'border-purple-500/30',
     },
-    {
-      value: '12',
-      label: de ? 'Produkt-Module' : 'Product Modules',
-      sub: de ? 'Security · Compliance · KI' : 'Security · Compliance · AI',
-      color: 'text-amber-400',
-      borderColor: 'border-amber-500/30',
-    },
   ]
 
   const languageBreakdown = [
@@ -139,7 +132,7 @@ export default function EngineeringSlide({ lang }: EngineeringSlideProps) {
 
       {/* Hero Stats */}
       <FadeInView delay={0.1}>
-        <div className="grid grid-cols-2 md:grid-cols-4 gap-3 mb-5">
+        <div className="grid grid-cols-3 gap-3 mb-5">
           {heroStats.map((stat, idx) => (
             <div
               key={idx}