feat(pitch): add SDK demo slide with screenshot gallery + inline preview

- New annex slide 'annex-sdk-demo' with auto-scrolling screenshot gallery
  (22 real screenshots from Müller Maschinenbau demo project)
- Browser chrome mockup, fullscreen view, thumbnail strip navigation
- Inline SDK dashboard preview on Product slide
- Seed script for creating demo data + taking Playwright screenshots
- Presenter script for SDK demo narration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pitch-deck/lib/i18n.ts

@@ -28,6 +28,7 @@ const translations = {
       'Anhang: Regulatorik',
       'Anhang: Engineering',
       'Anhang: KI-Pipeline',
+      'Anhang: SDK Demo',
     ],
     cover: {
       tagline: 'Compliance & Code-Security für den Maschinenbau',
@@ -251,6 +252,7 @@ const translations = {
       'Appendix: Regulatory',
       'Appendix: Engineering',
       'Appendix: AI Pipeline',
+      'Appendix: SDK Demo',
     ],
     cover: {
       tagline: 'Compliance & Code Security for Machine Manufacturers',