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>

configs/mosquitto/mosquitto.conf

@@ -0,0 +1,12 @@
+listener 1883
+protocol mqtt
+
+# Local dev / MVP only: no auth on the broker.
+# Before any real-device or public deployment, switch to per-device
+# username/password or client certificates and set allow_anonymous false.
+allow_anonymous true
+
+persistence true
+persistence_location /mosquitto/data/
+
+log_dest stdout