Backend: WAL+busy_timeout, DB↔Datei-Reconcile beim Start, zentraler JSON-Parser (jsonio)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/main.py

@@ -9,6 +9,7 @@ setup_logging()
 
 from config import FRONTEND_DIST, STORAGE_DIR
 from database import init_db, close_db
+from generator import reconcile_guides
 from routes import router
 
 
@@ -16,6 +17,7 @@ from routes import router
 async def lifespan(app: FastAPI):
     (STORAGE_DIR / "themen").mkdir(parents=True, exist_ok=True)
     await init_db()
+    await reconcile_guides()
     yield
     await close_db()