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/app/api/presenter/status/route.ts

@@ -0,0 +1,15 @@
+import { NextResponse } from 'next/server'
+
+/**
+ * Presenter Status API — for future multi-client sync.
+ * Currently returns a static structure; will be connected to
+ * server-side presenter state when WebSocket support is added.
+ */
+export async function GET() {
+  return NextResponse.json({
+    state: 'idle',
+    currentSlide: 0,
+    progress: 0,
+    message: 'Presenter status endpoint ready. State is managed client-side for now.',
+  })
+}