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/components/PitchDeck.tsx

@@ -38,6 +38,7 @@ import GTMSlide from './slides/GTMSlide'
 import RegulatorySlide from './slides/RegulatorySlide'
 import EngineeringSlide from './slides/EngineeringSlide'
 import AIPipelineSlide from './slides/AIPipelineSlide'
+import SDKDemoSlide from './slides/SDKDemoSlide'
 
 interface PitchDeckProps {
   lang: Language
@@ -154,6 +155,8 @@ export default function PitchDeck({ lang, onToggleLanguage }: PitchDeckProps) {
         return <EngineeringSlide lang={lang} />
       case 'annex-aipipeline':
         return <AIPipelineSlide lang={lang} />
+      case 'annex-sdk-demo':
+        return <SDKDemoSlide lang={lang} />
       default:
         return null
     }