Ship native iOS app, Wiki/TTS backend, and skeleton loading UX.

Replace the WebView shell with SwiftUI screens, add account-scoped Wiki and TTS APIs with adaptive review and photo scan support, and keep web/iOS pages usable while data loads asynchronously.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/routers/tts_router.py

@@ -0,0 +1,25 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi.responses import Response
+
+from auth import get_current_user
+from models import User
+from services.tts_service import TtsServiceError, tts_service
+
+router = APIRouter(prefix="/api", tags=["tts"])
+
+
+@router.get("/tts/speak")
+def speak_word(
+    text: str = Query(..., min_length=1, max_length=200),
+    current_user: User = Depends(get_current_user),
+):
+    try:
+        audio_bytes, content_type = tts_service.synthesize(text)
+    except TtsServiceError as exc:
+        raise HTTPException(status_code=503, detail=str(exc)) from exc
+
+    return Response(
+        content=audio_bytes,
+        media_type=content_type,
+        headers={"Cache-Control": "private, max-age=86400"},
+    )