feat(pitch-deck): legal disclaimer slide + projection footer on financial slides

New DisclaimerSlide (last slide):
- Full liability disclaimer (German/English)
- Confidentiality clause (purpose limitation, 3yr duration, Konstanz jurisdiction)
- Status as private individual in founding preparation

ProjectionFooter component on 4 financial slides:
- FinancialsSlide, TheAskSlide, FinanzplanSlide, CapTableSlide
- "Alle Finanzdaten sind Planzahlen" disclaimer

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

pitch-deck/lib/i18n.ts

@@ -37,6 +37,7 @@ const translations = {
       'Anhang: Strategie',
       'Anhang: Finanzplan',
       'Glossar',
+      'Rechtlicher Hinweis',
     ],
     executiveSummary: {
       title: 'Executive Summary',
@@ -333,6 +334,7 @@ const translations = {
       'Appendix: Strategy',
       'Appendix: Financial Plan',
       'Glossary',
+      'Legal Notice',
     ],
     executiveSummary: {
       title: 'Executive Summary',