remove legacy serv_spa (yalarba Vue SPA)

- Deleted main_dc/yalarba/serv_spa/ directory
- No docker-compose.yml changes needed (service was already unused)
- Updated docs references to point to yalarba-nuxt
- docker-compose.yml and nginx configs had no references to serv_spa

main_dc/yalarba/documentation/docs.md

@@ -155,7 +155,7 @@ docker-compose up -d
 
 ### Репозитории:
 - Фронтенд EasySite: `./yalarba/easySite/`
-- Фронтенд YalArba: `./yalarba/serv_spa/`
+- Фронтенд YalArba: `./yalarba/yalarba-nuxt/`
 - API-сервисы: `./yalarba/api_*`, `./BB/api_bb`
 
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