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.prod.example

@@ -0,0 +1,18 @@
+# Copy this file to .env and fill in real values before deploying
+
+# Database
+POSTGRES_USER=kosmo
+POSTGRES_PASSWORD=CHANGE_ME_TO_STRONG_PASSWORD
+POSTGRES_DB=kosmoconnect
+DATABASE_URL=postgresql://kosmo:CHANGE_ME_TO_STRONG_PASSWORD@timescaledb:5432/kosmoconnect
+
+# MQTT
+MQTT_HOST=mosquitto
+MQTT_PORT=1883
+MQTT_TOPIC=kosmo/ingest/enviro
+
+# BTCPay Server (Church of Kosmo)
+BTCPAY_URL=https://pay.cqre.net
+BTCPAY_API_KEY=your_btcpay_api_key
+BTCPAY_STORE_ID=your_btcpay_store_id
+WEBHOOK_SECRET=your_webhook_secret