Scaffold repo: infra docker-compose, service layout, README

Sets up the microservice home-automation platform skeleton: docker-compose
for mosquitto/postgres/clickhouse/redis/rabbitmq, per-service README stubs
describing responsibilities, and top-level README with architecture/stack.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

services/device-control-service/README.md

@@ -0,0 +1,20 @@
+# device-control-service (Go)
+
+Status: not implemented yet.
+
+Responsibility:
+- Expose a gRPC API (see `proto/device_control.proto`) for issuing commands
+  to devices — called by Laravel (manual control) and rule-engine-service
+  (rule-triggered actions).
+- Publish the command to the device's MQTT topic (`devices/{device_id}/commands`)
+  and listen for acknowledgements (`devices/{device_id}/ack`).
+- Maintain the Device Shadow pattern in Redis: `desired_state` (what the user
+  wants) vs `reported_state` (what the device confirmed), plus `status` and
+  `last_seen`.
+- Owns the health-check loop (or delegates to health-check-service): a ticker
+  goroutine that flips a device to `offline` when `last_seen` exceeds a
+  timeout, and emits an event for notification-service.
+
+Not this service's job: deciding *when* to send a command based on sensor
+thresholds — that's rule-engine-service's logic. This service only executes
+and tracks state for whatever command it's given.