docs: specifies lang in tripple quotes

backend/README.md

@@ -48,7 +48,7 @@ npm run dev -w backend
 
 ## Структура проекта
 
-```
+```text
 backend/src/
 ├── app.ts                  — точка входа: Express, миграции, монтирование роутов
 ├── config.ts               — чтение переменных окружения

frontend/README.md

@@ -12,7 +12,7 @@ React SPA для учёта семейного бюджета: импорт ба
 
 ## Структура
 
-```
+```text
 frontend/
 ├── index.html                  — точка входа
 ├── vite.config.ts              — конфигурация Vite (прокси на backend)

package-lock.json

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@@ -1569,6 +1572,7 @@
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