feat(pitch-deck): add USP slide + update cover and problem texts

- Cover: remove "für den Maschinenbau" from tagline
- Problem subtitle: Maschinenbauer → Deutsche und europäische Unternehmen
- New USP slide after Solution: bridge between compliance docs/audits
  and actual code implementation — RFQ verification, bidirectional sync,
  automated process compliance, continuous instead of annual checks

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

pitch-deck/components/PitchDeck.tsx

@@ -41,6 +41,7 @@ import GTMSlide from './slides/GTMSlide'
 import RegulatorySlide from './slides/RegulatorySlide'
 import EngineeringSlide from './slides/EngineeringSlide'
 import AIPipelineSlide from './slides/AIPipelineSlide'
+import USPSlide from './slides/USPSlide'
 import ExecutiveSummarySlide from './slides/ExecutiveSummarySlide'
 import RegulatoryLandscapeSlide from './slides/RegulatoryLandscapeSlide'
 import CapTableSlide from './slides/CapTableSlide'
@@ -148,6 +149,8 @@ export default function PitchDeck({ lang, onToggleLanguage, investor, onLogout,
         return <ProblemSlide lang={lang} />
       case 'solution':
         return <SolutionSlide lang={lang} />
+      case 'usp':
+        return <USPSlide lang={lang} />
       case 'regulatory-landscape':
         return <RegulatoryLandscapeSlide lang={lang} />
       case 'product':