feat: initial KosmoConnect platform v0.1

Includes:
- Backend services: ingestion (:8001), weather API (:8002),
  gateway (:8003), billing (:8004) with BTCPay integration
- Shared asyncpg pool, TimescaleDB hypertable, Redis, Mosquitto MQTT
- React frontend: Dashboard (MapLibre) and Messaging (chat UI)
- Bridge daemon for Pi + Meshtastic (Serial/TCP T-Deck support)
- Production Docker Compose, Nginx reverse proxy, ops scripts
- DEPLOY.md with step-by-step deployment guide

backend/.env.example

@@ -0,0 +1,5 @@
+# Copy this file to .env and adjust as needed
+DATABASE_URL=postgresql://kosmo:kosmo_dev_pass@localhost:5432/kosmoconnect
+MQTT_HOST=localhost
+MQTT_PORT=1883
+MQTT_TOPIC=kosmo/ingest/enviro