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/lib/slide-order.ts

@@ -6,6 +6,7 @@ export const SLIDE_ORDER: SlideId[] = [
   'cover',
   'problem',
   'solution',
+  'usp',
   'regulatory-landscape',
   'product',
   'how-it-works',