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>

.env.example

@@ -0,0 +1,37 @@
+# --- PostgreSQL (users, zones, devices, device_types, automation_rules) ---
+POSTGRES_HOST=postgres
+POSTGRES_PORT=5432
+POSTGRES_DB=home_automation
+POSTGRES_USER=home_automation
+POSTGRES_PASSWORD=change_me
+
+# --- ClickHouse (telemetry, time-series) ---
+CLICKHOUSE_HOST=clickhouse
+CLICKHOUSE_HTTP_PORT=8123
+CLICKHOUSE_NATIVE_PORT=9000
+CLICKHOUSE_DB=telemetry
+CLICKHOUSE_USER=default
+CLICKHOUSE_PASSWORD=change_me
+
+# --- Redis (device shadow: desired/reported state, status, last_seen) ---
+REDIS_HOST=redis
+REDIS_PORT=6379
+REDIS_PASSWORD=
+
+# --- RabbitMQ (async events between Go services) ---
+RABBITMQ_HOST=rabbitmq
+RABBITMQ_PORT=5672
+RABBITMQ_MANAGEMENT_PORT=15672
+RABBITMQ_USER=home_automation
+RABBITMQ_PASSWORD=change_me
+
+# --- Mosquitto (MQTT broker, device <-> ingest/device-control) ---
+MQTT_HOST=mosquitto
+MQTT_PORT=1883
+
+# --- device-control-service (gRPC) ---
+DEVICE_CONTROL_GRPC_PORT=50051
+
+# --- Laravel app (stage 2) ---
+APP_KEY=
+APP_URL=http://localhost:8000