feat(pitch-deck): business model redesign + umlauts fix + tab animations

Business Model slide completely rewritten:
- Left: 3 pricing tiers (Starter/Professional/Enterprise)
- Right: Unit Economics (ACV, Gross Margin, NRR, Payback)
- Bottom-up sizing: 1,200 customers × 8,400 ACV = 10M ARR
- Land & Expand arrow visualization

Umlauts: 75+ ae/oe/ue → ä/ö/ü replacements across 10 slide files

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

pitch-deck/components/slides/ArchitectureSlide.tsx

@@ -55,7 +55,7 @@ export default function ArchitectureSlide({ lang }: ArchitectureSlideProps) {
       bg: 'bg-blue-500/10 border-blue-500/20',
       title: de ? 'Plattform-Services' : 'Platform Services',
       items: [
-        { label: de ? 'Admin-Dashboard' : 'Admin Dashboard', desc: 'Next.js · ' + (de ? 'Mandantenfaehig · Rollenbasiert' : 'Multi-Tenant · Role-Based') },
+        { label: de ? 'Admin-Dashboard' : 'Admin Dashboard', desc: 'Next.js · ' + (de ? 'Mandantenfähig · Rollenbasiert' : 'Multi-Tenant · Role-Based') },
         { label: 'SDK API', desc: 'Go/Gin · REST · ' + (de ? 'Tenant-isoliert' : 'Tenant-Isolated') },
         { label: 'DevSecOps Suite', desc: 'Semgrep · Trivy · Gitleaks · CycloneDX SBOM' },
       ],
@@ -66,7 +66,7 @@ export default function ArchitectureSlide({ lang }: ArchitectureSlideProps) {
     { icon: Lock, label: de ? 'Zero-Trust Architektur' : 'Zero-Trust Architecture' },
     { icon: Database, label: de ? 'Daten verlassen nie BSI-zertifizierte Server in DE' : 'Data Never Leaves BSI-Certified Servers in DE' },
     { icon: Globe, label: de ? '100% EU-Cloud · Keine US-Anbieter' : '100% EU Cloud · No US Providers' },
-    { icon: Workflow, label: de ? 'Air-Gap faehig' : 'Air-Gap Capable' },
+    { icon: Workflow, label: de ? 'Air-Gap fähig' : 'Air-Gap Capable' },
   ]
 
   return (