feat(pitch-deck): add AI Presenter mode with LiteLLM migration and FAQ system

- Migrate chat API from Ollama to LiteLLM (OpenAI-compatible SSE)
- Add 15-min presenter storyline with bilingual scripts for all 20 slides
- Add FAQ system (30 entries) with keyword matching for instant answers
- Add IntroPresenterSlide with avatar placeholder and start button
- Add PresenterOverlay (progress bar, subtitle text, play/pause/stop)
- Add AvatarPlaceholder with pulse animation during speaking
- Add usePresenterMode hook (state machine: idle→presenting→paused→answering→resuming)
- Add 'P' keyboard shortcut to toggle presenter mode
- Support [GOTO:slide-id] markers in chat responses
- Dynamic slide count (was hardcoded 13, now from SLIDE_ORDER)
- TTS stub prepared for future Piper integration

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

pitch-deck/lib/i18n.ts

@@ -8,6 +8,7 @@ const translations = {
       language: 'Sprache',
     },
     slideNames: [
+      'Intro',
       'Cover',
       'Das Problem',
       'Die Loesung',
@@ -25,6 +26,8 @@ const translations = {
       'Anhang: Architektur',
       'Anhang: Go-to-Market',
       'Anhang: Regulatorik',
+      'Anhang: Engineering',
+      'Anhang: KI-Pipeline',
     ],
     cover: {
       tagline: 'Compliance & Code-Security fuer den Maschinenbau',
@@ -228,6 +231,7 @@ const translations = {
       language: 'Language',
     },
     slideNames: [
+      'Intro',
       'Cover',
       'The Problem',
       'The Solution',
@@ -245,6 +249,8 @@ const translations = {
       'Appendix: Architecture',
       'Appendix: Go-to-Market',
       'Appendix: Regulatory',
+      'Appendix: Engineering',
+      'Appendix: AI Pipeline',
     ],
     cover: {
       tagline: 'Compliance & Code Security for Machine Manufacturers',