feat: замена Kafka → shared-SQS в IoT pipeline

- mqtt-bridge: kafka.Writer → SQS SendMessage (AWS SDK Go v2)
- kafka-consumer → sqs-consumer: polling loop с ReceiveMessage/DeleteMessage
- admin stats: Kafka lag → SQS GetQueueAttributes
- Удалён kafka-consumer, добавлен sqs-consumer
- go.mod: убран segmentio/kafka-go, добавлен aws-sdk-go-v2
- Dockerfile, Makefile: kafka-consumer → sqs-consumer
- .gitignore: исправлен чтобы не игнорировать cmd/ директории
- deployments: новый iot-sqs-consumer.yaml, обновлён mqtt-bridge
- doc/decisions: задокументировано решение

Makefile

@@ -15,16 +15,7 @@ build-bridge:
 CGO_ENABLED=0 go build -o bin/mqtt-bridge ./cmd/mqtt-bridge/
 
 build-consumer:
-CGO_ENABLED=0 go build -o bin/kafka-consumer ./cmd/kafka-consumer/
-
-# Docker
-docker-build:
-docker build -t $(IMG) .
-
-docker-push:
-docker push $(IMG)
-
-# Тесты и go mod
+	CGO_ENABLED=0 go build -o bin/sqs-consumer ./cmd/sqs-consumer/
 test:
 go test ./...