chore(scripts): add make down and clean targets

- Why:
  - intensive development needs quick cluster stop/cleanup commands
  - current Makefile had only up and pipeline/monitoring targets
- What:
  - add make target down for standard docker compose shutdown
  - add make target clean for full cleanup with volumes and orphans
  - update OPERATIONS runbook with new make commands
- Check:
  - make -n down clean

Makefile

@@ -1,10 +1,18 @@
-.PHONY: up ddl data transform reload-monitoring recover-monitoring
+.PHONY: up down clean ddl data transform reload-monitoring recover-monitoring
 
 COMPOSE ?= docker compose
 
 up:
 	$(COMPOSE) up -d
 
+# Остановить и удалить контейнеры/сети текущего проекта
+down:
+	$(COMPOSE) down
+
+# Полная очистка окружения проекта (включая volumes)
+clean:
+	$(COMPOSE) down -v --remove-orphans
+
 ddl:
 	bash ./scripts/apply_clickhouse_ddl.sh