feat: add REST API for flashcards (/api/v1/flashcards/*)

main.go

@@ -70,6 +70,7 @@ func main() {
 		})
 	})
 	mux.Handle("/mcp", authMiddleware(token, streamableServer))
+	registerAPI(mux, sqliteStore, logger)
 
 	httpServer := &http.Server{
 		Addr:    ":" + port,