feat(pitch-deck): rename Traction → Meilensteine, update milestones data

- i18n: Traction & Meilensteine → Meilensteine / Milestones
- slideNames updated (DE + EN)
- Chat display name updated
- Milestones data replaced via MCP (both versions):
  13 milestones chronologically: domains, DPMA, IHK, prototype,
  pilot customers, RAG pipeline, EUIPO, L-Bank, Gründerzuschuss,
  GmbH founding, onboarding, App Store, distribution
- Metrics updated: 385 docs, 25k controls, 12 modules, etc.

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

pitch-deck/app/api/chat/route.ts

@@ -17,7 +17,7 @@ const SLIDE_DISPLAY_NAMES: Record<string, { de: string; en: string }> = {
   'how-it-works': { de: 'So funktioniert\'s', en: 'How It Works' },
   'market': { de: 'Markt', en: 'Market' },
   'business-model': { de: 'Geschäftsmodell', en: 'Business Model' },
-  'traction': { de: 'Traction', en: 'Traction' },
+  'traction': { de: 'Meilensteine', en: 'Milestones' },
   'competition': { de: 'Wettbewerb', en: 'Competition' },
   'team': { de: 'Team', en: 'Team' },
   'financials': { de: 'Finanzen', en: 'Financials' },